2025 Kia K4 Expert Review: Drive, Performance & Specs Tested

The 2025 Kia K4 is stepping up the game in the compact sedan world, taking over from the Forte with a more refined and tech-savvy design. This new ride is Kia’s way of saying, “Hey, we can do better!” It’s all about bringing those high-end features and styling that you usually find in pricier cars down to a more wallet-friendly level.

Now, when we look at the compact sedan arena, the K4 has some heavyweights to contend with—think Honda Civic, Toyota Corolla, Hyundai Elantra, Mazda 3, and Volkswagen Jetta. The Civic is a standout with its fun driving experience and smooth engine, while the Corolla boasts reliability and even offers a hybrid option. The Elantra shares a platform with the K4 and has a similar feature set but with a different look. And then there’s the Mazda 3, which leans into that premium vibe and offers all-wheel drive.

Speaking of dimensions, the K4 is a bit of a game-changer. It stretches out to 185.4 inches long and 72.8 inches wide, which is a noticeable upgrade from the old model. This size boost means it has a whole lot of interior space, especially in the back, where rear seat legroom hits 38 inches—just as roomy as the Hyundai Elantra and better than most of its rivals.

When it comes to pricing, Kia has done a fine job balancing a premium feel with affordability. Starting at $23,145 for the base LX trim, it’s a solid deal considering all the standard features packed in. If you’re looking to go all out, the top-tier GT-Line Turbo comes in at $29,245, dipping into territory usually reserved for entry-level luxury cars.

Kia seems to have its sights set on younger buyers who are diving into the new car market—especially those who care about style and tech. The design takes cues from Kia’s pricier models, like the K5 and even the now-gone Stinger, giving it a more upscale look than what you’d typically expect in this class.

However, it’s worth noting that the K4 skips some popular features in this segment, like a hybrid powertrain or all-wheel drive. Looks like Kia is banking on style, tech, and spaciousness to make this car stand out. This strategy seems especially smart in areas where sedans still have a strong fanbase, even with crossovers and SUVs on the rise.

A hatchback variant has been confirmed for late 2025, potentially addressing a niche market segment that some competitors have abandoned. This upcoming variant could provide additional utility while maintaining the K4’s premium positioning.

The powertrain lineup for the 2025 K4 is interesting, offering two different engine choices that cater to various buyer preferences and budgets. First up, we’ve got the base engine, which is a naturally aspirated 2.0-liter four-cylinder. It cranks out about 147 horsepower and 132 lb-ft of torque. This engine is paired with Kia’s intelligent variable transmission, or IVT, which is basically their version of a continuously variable transmission (CVT).

If you’re looking for something a bit more powerful, the GT-Line Turbo trim has you covered. It sports a turbocharged 1.6-liter four-cylinder engine that delivers a solid 190 horsepower and 195 lb-ft of torque. This one comes with an 8-speed automatic transmission, moving away from the dual-clutch transmission that was in the previous Forte GT model. Just a heads-up, the power here is a tad less than the Forte GT’s 201 horsepower, mainly because of new emissions standards.

When it comes to performance, the GT-Line Turbo can hit 0-60 mph in about 7.3 seconds, with quarter-mile times around 15.7 seconds at 90 mph. Not groundbreaking, but definitely competitive for your run-of-the-mill compact sedan. The base engine? Well, it hasn’t been officially tested, but you can probably expect 0-60 times in the mid-9-second range.

The IVT transmission in base models deserves special mention for its refined operation. Unlike some competitors’ CVTs, Kia’s implementation uses a chain-driven system that provides more natural-feeling acceleration and less of the “rubber-band” effect common to belt-driven CVTs. The transmission’s programming prioritizes smoothness and efficiency over sporty response.

The 8-speed automatic in the GT-Line Turbo does a good job too, providing smooth shifts and smart gear selection. Though, yeah, we have pointed out that it can hesitate a little when you really want to downshift aggressively. It does have paddle shifters for a more engaged driving experience, but the response isn’t quite as snappy as some sportier rivals.

Now, fuel efficiency? That varies quite a bit between the two engines. The base 2.0-liter engine gets decent EPA ratings of 30 mpg in the city and 40 mpg on the highway, which is competitive. On the flip side, the turbocharged engine sacrifices some efficiency for that extra power, coming in at 26 mpg city and 36 mpg highway. In real-world tests, the GT-Line Turbo managed about 35 mpg on the highway.

Both engines are friendly to your wallet too, as neither requires premium fuel, which is a big plus for budget-conscious shoppers. You can expect around 400 miles of range with the base engine, depending on your driving style.

One thing to note, though, is that there’s no manual transmission option for the GT-Line Turbo. This is a shift away from the enthusiast-friendly feel of the previous Forte GT. While it makes sense with market trends, it might leave some driving fans a bit disappointed who were hoping for that sporty touch in Kia’s compact sedan.

The braking system in the 2025 K4 shows how Kia is all about finding that sweet spot between performance and everyday practicality. Take the GT-Line Turbo model, for example. It’s got these impressive 16.0-inch vented front disc brakes and 15.0-inch solid rear discs, which give it a solid amount of stopping power for a car in its class.

When it comes to performance testing, the GT-Line Turbo managed a stopping distance of 173 feet from 70 to 0 mph. That’s pretty competitive, if we’re being honest, though it doesn’t quite take the top spot in the segment. What’s nice is that the brake pedal feels responsive right from the start, and you can feel it progress smoothly as you press down, which definitely builds confidence for your daily drives.

For the lower trim levels, they’ve gone with slightly smaller brake rotors, but hey, they still stick with a four-wheel disc brake setup. That’s actually a big deal since some rivals are still using drum brakes at the back of their base models. So, Kia’s commitment to four-wheel disc brakes across all trims helps ensure consistent stopping power, no matter which version you choose.

Also, the brake system comes packed with some electronic aids as standard, like Electronic Brake-force Distribution (EBD) and Brake Assist (BA). These features are super handy in emergencies or when you’ve got different loads in the car.

Now, here’s a nice touch: the electronic parking brake is standard on all trims and has an auto-hold function. It’s a lifesaver in stop-and-go traffic, right? You don’t always find that kind of feature in this segment, so it’s a bit of a premium perk.

When it comes to brake fade resistance, it holds up pretty well under normal driving conditions. But, if you really push it with some aggressive driving, you might notice it doesn’t quite measure up to more sporty competitors. But honestly, that’s not what the K4 is about. It’s more about being a comfy daily driver instead of a full-on sports sedan.

As for maintenance, the braking system requirements are pretty much in line with what you’d expect in this segment. The components are easy to access for servicing, which is a bonus. Kia suggests changing the brake fluid every 30,000 miles or every two years—whichever comes first. So, yeah, it all seems straightforward.

When you look at the K4, it’s pretty clear that Kia prioritizes comfort in its steering and suspension designs while still managing to keep things handleable. Take the electric power steering system, for instance; it’s got variable assistance. And if you’re driving the GT-Line models, you can even tweak it through different drive modes.

The suspension setup changes a bit depending on the trim level you choose. For the GT-Line models, you get this fancy multi-link independent rear suspension which is, let’s be honest, a step up. The lower trims, however, go with a torsion beam rear setup. It’s fine for everyday driving, sure, but doesn’t match the dynamic feel of that multi-link system.

Speaking of the GT-Line, that multi-link rear suspension does wonders for wheel control—especially when you hit some bumpy roads or take sharp turns. It allows for some fine-tuning of how the car rides and handles, leading to better control during cornering without sacrificing comfort.

When you’re in normal steering mode, it finds a nice middle ground between being easy to handle and giving you decent feedback. Flip it to sport mode, and while it adds a bit of weight to the steering, you might not feel a huge difference in terms of road feedback. Still, it keeps things predictable and comfortable for your everyday drives.

As for the suspension, it leans more toward comfort rather than a sporty feel, which means it does a solid job absorbing those pesky road imperfections. And if you go for the GT-Line, you’ll notice it handles tougher road conditions with noticeably more poise, thanks to that upgraded rear suspension.

Now, regarding road noise, that can change based on the trim you pick. The GT-Line models have the upper hand, featuring extra sound insulation and acoustic glass. They also come with special tires designed to cut down on road noise getting into the cabin.

Lastly, the K4 has a wider track compared to its earlier version, which helps with stability, especially when you’re cruising on the highway or switching lanes. This wider stance also does a good job of minimizing body roll when you’re turning. So, overall, it strikes a nice balance between comfort and handling!

It’s got three different tire sizes across its various trims. Each one is matched up with specific wheel designs and what the vehicle can handle. Starting with the base LX trim, you get these 16-inch wheels with 205/55R16 tires. They really focus on comfort and help with fuel efficiency—pretty neat, right?

If you step up to the mid-level trims, you’ll find 17-inch wheels paired with 215/50R17 tires. This combo strikes a nice balance between how the car rides and how it handles. And then there’s the GT-Line Turbo; it’s got 18-inch wheels and 235/40R18 Kumho Majesty 9 Solus TA91 tires. These tires not only boost grip but also make the car look good.

Speaking of the GT-Line Turbo, those Kumho tires come with this cool noise-reducing tech—it’s marked as “Ksilent.” Basically, it works with other features to help reduce noise in the cabin. But, let’s be real, you might still hear some road noise here and there.

All K4 models come equipped with a temporary spare tire, an increasingly rare feature in modern vehicles where many manufacturers opt for tire repair kits. This provision offers additional peace of mind for drivers who may encounter a flat tire in areas where immediate service isn’t available.

Also, across all trims, there’s a tire pressure monitoring system. You’ll find a display in the instrument cluster that shows the pressure for each tire individually. It’s a handy feature that helps keep everything at the right pressure for safety, performance, and efficiency.

When it comes to the tire sizes and compounds they picked, it seems like they really thought about balancing performance, comfort, and efficiency. But, just a heads up—those larger wheels and lower-profile tires on the higher trims can affect ride quality a bit, especially if you’re driving on bumpy roads.

The K4’s interior design is something special—it’s a big leap forward when it comes to looks and the quality of materials. You’ve got this sleek horizontal dashboard that catches the eye, and it cleverly integrates up to three screens, giving it that high-tech vibe that many people are after.

The main attraction is the standard 12.3-inch touchscreen display, which integrates seamlessly with the available 12.3-inch digital instrument cluster on higher trims. Between these displays, a 5-inch screen handles climate control functions, though its position can be partially obscured by the steering wheel.

As for materials, they change depending on which trim you go for, but they all stick to a modern, classy feel. The GT-Line models, for instance, boast a snazzy two-tone interior with synthetic leather, while the more basic trims are decked out in high-quality cloth that looks great.

You’ll notice the dashboard has soft-touch surfaces where you usually put your hands, while the tougher plastics are saved for lower sections. Kia has made a smart choice by ditching the piano black finishes, which scratch easily, and instead opting for matte surfaces that are way better at resisting fingerprints.

When it comes to the center console, it’s all about practicality. There’s a traditional gear selector, plus storage areas that are easy to reach and cupholders that can adjust to fit your drinks just right. Oh, and the wireless charging pad is conveniently placed just in front of the gear shifter—super handy for your smartphone!

As for lighting, if you opt for the higher trims, you get some nice ambient illumination that sets a premium mood when you’re driving at night. You can even customize the lighting through the infotainment system, which is a nice touch for personalizing your space.

The steering wheel has a cool flat-bottom and flat-top design, with a Kia logo that’s slightly off-center, giving it a unique twist. Plus, the controls are laid out nicely, so everything feels organized and neat without being cluttered.

Its exterior design showcases Kia’s new styling vibe. We mean, it’s got these bold lines and unique details that definitely make it stand out in the crowd of compact sedans. Just look at the front! It’s got this updated tiger nose grille that’s flanked by LED headlights – and you can find that across all the different trim levels, which is pretty cool.

If you check out the GT-Line models, they’ve got some special elements that give them a bit more flair. There’s a more aggressive front bumper design, plus those unique LED lighting signatures. And the GT-Line Turbo? Oh boy, it comes with these eye-catching cube-projection LED headlights and fog lights, which just scream premium, don’t you think?

Moving to the side, one of the standout features is the fastback-style roofline. It gives the K4 this coupe-like look, which is quite stylish! They’ve even integrated the rear door handles into the C-pillar, making the side profile look clean and sleek.

Now, here’s a fun fact: the K4 is actually bigger than its predecessor! We’re talking about a length of 185.4 inches and a width of 72.8 inches. This increase gives it a more solid presence on the road, almost like it’s stepping into the midsize sedan territory.

When it comes to wheels, there’s a variety depending on the trim level. You’ve got everything from 16-inch steel wheels with covers on the base models to 18-inch alloy wheels on the sporty GT-Line versions. And let’s not forget the GT-Line Turbo – it gets these slick gloss black wheels that match its sporty vibe.

Swing around to the back, and you’ll see full-width LED taillights on the higher trims, which creates a striking look at night. The trunk lid has a subtle integrated spoiler, adding a nice touch, while the lower bumper design changes depending on the trim, with the GT-Line models getting a more aggressive look.

As for colors, there are some sophisticated options available. One that stands out is the Morning Haze color, which can look like a greenish-gray depending on the lighting. Overall, the color palette is more about those premium, sophisticated tones rather than anything too bright or flashy, which we think is a nice touch.

First off, the front seats are designed well—they offer solid support for all kinds of body types. If you opt for the higher trims, you’ll enjoy a driver’s seat with 10-way power adjustment and two-position memory settings.

When it comes to climate control, it’s not one-size-fits-all. The systems differ by trim, with the upper trims boasting dual-zone automatic climate control. And that 5-inch climate control display? It’s a unique touch that lets you manage temperature and fan settings digitally, but don’t worry—traditional buttons are still there for essential tasks.

The available ventilated front seats prove particularly effective, a premium feature rarely found in this segment. Heated front seats come standard on certain trims, though heated rear seats and heated steering wheel availability vary by market.

As for storage, you’ve got a wireless charging pad, plenty of USB-C ports, and some smartly designed cupholders that can adjust their size. The center console has enough space, and the door pockets are handy for stashing water bottles and other small items.

If you’re in a GT-Line Turbo model, you’ll find a wide panoramic sunroof that adds a nice, open feel to the cabin. The power sunshade? It’s made from quality fabric, and it works quietly and smoothly.

Noise, vibration, and harshness (NVH) control does vary by trim. The GT-Line models get extra sound insulation and acoustic glass, which is cool. Sure, you might still notice some road noise—especially if you’ve got the bigger wheels—but overall, it’s pretty refined for this segment.

Getting in and out is easy, even with that sloping roofline. Just keep in mind that the rear door handles might take a little getting used to. And speaking of convenience, the smart trunk feature is a lifesaver when your hands are full—it opens automatically when you approach with the key fob.

If you’re into music, the Harman Kardon premium audio system is something to check out. With eight speakers, it delivers impressive sound quality—rich bass and clear highs without much distortion, even when you crank it up. Plus, you can tweak the audio settings through the infotainment system, playing around with different equalizer presets and adjusting the bass, midrange, and treble.

The Digital Key 2.0 is a cool feature too. It lets you use your smartphone as a key, and you can even share digital keys with family or friends. It also allows remote start and keeps you updated on your vehicle’s status via Kia’s smartphone app.

For those who love tech, the K4 offers a 360-degree camera system that gives you high-res views around the vehicle. You get multiple angles and a 3D surround view mode, something you usually see in luxury cars. The graphics and responsiveness? Quite impressive for the price!

Thanks to over-the-air updates, the K4’s tech will stay fresh throughout your ownership. This means that both infotainment features and certain vehicle systems can get updates, showing that Kia is really committed to keeping owners happy in the long run.

If you like to set the mood, the customizable ambient lighting system on the higher trims lets you personalize the cabin atmosphere. You can pick from various colors, all adjustable via the infotainment interface.

Connected car features include integration with various streaming services and cloud-based navigation with real-time traffic updates. The system also includes natural language voice recognition for hands-free control of various vehicle functions.

MyQ garage door opener integration, available through a software update beginning in January 2025, adds convenient smart home connectivity. This feature allows drivers to control compatible garage doors directly through the vehicle’s infotainment system.

The safety package in the K4 is impressive. It comes packed with a bunch of standard features across all trim levels. For starters, there’s the Forward Collision-Avoidance Assist, which even has pedestrian detection. So, if you find yourself in a sticky situation, this system can automatically apply the brakes to help avoid or lessen the impact of a frontal crash.

Then you’ve got the Lane Keeping Assist and Lane Following Assist, which are also standard. They do a solid job at keeping the car nicely positioned within the lane markings. And honestly, the steering assistance feels just right—not too pushy, which is great for everyday driving.

If you’re looking at models other than the base LX, you’ll find that they come equipped with Blind-Spot Collision-Avoidance Assist and Rear Cross-Traffic Collision-Avoidance Assist. These features don’t just beep at you; they actually step in to help prevent accidents when you’re changing lanes or backing up.

There’s more! The Highway Driving Assist system is available too. It combines adaptive cruise control with lane centering, giving you that semi-automated driving experience on the highway. And for the top trims, there’s version 2.0 of this system, which offers even cooler features, like automated lane changes.

If you check out the GT-Line Turbo, you’ll find an available tech package that includes a surround-view monitor. It’s got high-res cameras and multiple angles, which is super handy when you’re parking in tight spots.

Standard Smart Exit Warning prevents rear passengers from opening doors when approaching traffic is detected, an especially valuable feature for families with children. The system can maintain door locks engaged until the hazard passes.

The K4 doesn’t skimp on safety structure. It’s built with high-strength steel in crucial spots and comes with multiple airbags, including side curtain airbags for both rows. Plus, every seat is fitted with three-point seatbelts that have pretensioners. So, you can feel pretty secure in this ride.

The K4 shows a different personality depending on whether you go for the base 2.0-liter or the turbocharged 1.6-liter models. Now, the base engine? It’s smooth and delivers power in a way that’s just right for everyday driving. But, honestly, when you’re merging or trying to overtake, you might find the acceleration a bit on the modest side.

If you’re in the GT-Line Turbo, oh boy, you can feel that extra oomph, especially in mid-range acceleration. That 195 lb-ft of torque? It’s got your back for confident passing. The 8-speed automatic transmission usually does a decent job of handling the power. Just a heads-up though—it can be a bit slow to respond sometimes when you want a quick downshift.

Ride quality is impressive across the board, and you’ll notice it especially when tackling those bumpy urban roads. The GT-Line models come with a multi-link rear suspension that helps with wheel control and gives a more refined handling experience, though it still leans more towards comfort than a sporty feel.

On the highway, the K4’s wider stance and longer wheelbase compared to the older model really shine through. You’ll find it tracks straight, and you won’t have to fiddle with the steering too much. Plus, wind noise? It’s kept in check, even when you’re cruising at higher speeds.

When it comes to city driving, don’t be fooled by the larger size—it’s still pretty nimble. The standard backup camera and optional parking sensors really help out, and the turning radius? It’s competitive enough to make parking in tight spots a breeze.

You’ve got two drive modes to choose from: Normal and Sport. They mainly tweak how the throttle responds and the weight of the steering. Sport mode does add a bit of heft to the steering, but it doesn’t change the overall vibe of the car too much—it still leans toward comfort.

As for the brakes, they feel nice and responsive during regular driving, making it easy to come to a smooth stop. Emergency stopping power is okay, but if you’re hitting the brakes hard multiple times, you might notice a bit of fade. Just something to keep in mind!

The rear seat area in the K4 stands out as one of its best features. We mean, with a legroom of 38 inches, adult passengers can actually stretch out and feel comfortable back there. Plus, the wider design of the vehicle means there’s decent shoulder space for three people to sit side by side without feeling too cramped.

About seat comfort—it’s impressive. The cushions are nicely shaped, and they offer good support for your thighs, which is a big plus, especially for taller folks. The angle of the seat back is a nice compromise between being comfy and saving some space, even though you can’t adjust it.

When it comes to the rear amenities, they do change depending on the trim level. For instance, if you go for the GT-Line Turbo models, you get dedicated air vents, which is something the lower trims don’t have. Still, all versions come with two USB-C ports for charging, which is super handy for passengers.

The center armrest? It’s got built-in cupholders, and it’s positioned well for those longer trips. Plus, its width means that both passengers on the sides can share it without any hassle.

As for headroom, it’s decent, even with that sloping roofline. Just a heads up, though—tall passengers might find it a bit snug up there. If you opt for the panoramic sunroof, it does cut down on headroom a little, but it also brings in this great sense of openness to the back.

Moving on to the door panels in the rear, they’re made of more basic materials compared to the front, but hey, the areas you touch are still padded enough to feel comfortable. For storage, you’ve got door pockets that can hold water bottles and seatback pockets on the front seats, which are nice for stashing snacks or small items.

The K4 has a trunk that boasts 14.6 cubic feet of cargo space. It’s one of the roomier options you’ll find in the compact sedan category. The shape is practical too, with a wide opening that makes it easier to load up larger items without a fuss.

On some trims, there’s a handy smart opening feature on the trunk lid. Basically, if you’re standing behind the car with the key fob, it’ll pop open automatically. This hands-free option is super convenient, especially if you’re juggling bags or something else.

The interior trunk finish maintains good quality, with a fully lined cargo area and minimal intrusion from the gooseneck hinges. The trunk includes several tie-down points for securing cargo, though they’re positioned somewhat high on the trunk walls.

Another great thing is the 60/40 split-folding rear seats. They come standard on all trims except the base LX, and they help when you need extra cargo space. Accessing the seat releases from the trunk is straightforward, but some competitors do have releases that are a bit easier to reach.

Under the trunk floor, you’ll find a temporary spare tire—definitely a nice touch since many other brands are opting for tire repair kits these days. Plus, that spare tire well gives you a little extra hiding spot for smaller items.

When it comes to loading up at night, the LED lights in the trunk do a good job of lighting things up. They’re positioned to keep shadows at bay, which is a nice detail. And the trunk lid opens high enough that taller folks won’t have to worry about bumping their heads.

Lastly, the load lip is at a reasonable height, though it’s not as low as some rivals. So, loading heavier stuff might take a little extra effort, but it’s manageable.

So, the 2025 Kia K4 is hitting the market with a pretty solid deal, starting at around $23,145 for the base LX trim. And honestly, this entry-level model packs a punch with some nice standard features. We’re talking about a 12.3-inch touchscreen, wireless Apple CarPlay and Android Auto, plus full LED lighting. Sure, it might be missing a few extra conveniences, but with modern tech and standard safety features, it’s definitely a strong contender in its class.

Now, if you want to step it up a bit, the LXS trim is priced at $24,145 and adds some valuable perks. You get blind spot monitoring, rear cross-traffic alert, and those handy 60/40 split-folding rear seats. Honestly, paying an extra grand for all those safety and convenience upgrades? Totally worth it.

Then there’s the EX trim, sitting at $25,145. This one seems to hit the sweet spot. You get synthetic leather upholstery, dual-zone climate control, and heated front seats. It’s a nice mix of comfort and price that makes it appealing to a lot of buyers.

Moving on, the GT-Line, priced at $26,345, brings some sporty flair and improved handling thanks to a multi-link rear suspension. The visual upgrades? Yeah, they’re pretty appealing. But, if you’re after real performance benefits, you’ll want to check out the GT-Line Turbo.

And speaking of the GT-Line Turbo, this top-tier model comes in at $29,245. It’s got some serious upgrades, like a 190-horsepower turbocharged engine, an 8-speed automatic transmission, ventilated seats, and a bunch of premium tech features. Sure, it’s on the pricier side for this segment, but when you compare it to entry-level luxury vehicles, it holds its own pretty well.

One thing that stands out is Kia’s warranty coverage. We mean, who doesn’t love that? You get a 5-year/60,000-mile basic warranty and a 10-year/100,000-mile powertrain warranty—definitely beats most competitors and gives you that peace of mind for the long haul.

If you’re a daily commuter, the EX trim seems to offer the best combo of features and value. Tech lovers will probably geek out over the GT-Line Turbo with its advanced features. And hey, for those on a budget, the LXS trim with its safety upgrades is a smart choice.

When you look at the K4, its value really shines through with all those standard features, competitive pricing, and solid warranty coverage. Now, it’s worth noting that some folks might wish for a hybrid option or all-wheel drive, which could be a dealbreaker for some. Plus, if you want certain desirable features, you’ll have to shell out for the higher trims, which might be a bit of an investment.

In the grand scheme of things, the 2025 Kia K4 does a great job of bringing premium features and tech to a more mainstream price point. Each trim has its perks for the price, but we’d say the EX trim is probably the best bet for most buyers. With this pricing strategy, Kia is making those upscale features accessible while still holding its ground against other mainstream rivals.