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Kia U.K. builds a 420-horsepower Stinger GT track car

The Kia Stinger GT is an admirable sports sedan, er, hatchback, with 365 horsepower. But Kia's U.K. branch wanted more, leading to the 420-horsepower Singer GT420 you see here. As Kia explains, the car used to create this one-off track car is actually the first Stinger GT pre-production test car in the U.K. It was used for final testing, photography, and was even featured on Top Gear and The Grand Tour. Once its testing and publicity duties were over, though, it was slated to be crushed. But some delaying and the idea of building a track car saved it. To get it to its final output ratings of 420 horsepower and 413 pound-feet of torque, Kia (with help from Hyundai Motor Group's technical team in Germany) added a high-flow air filter, aftermarket exhaust without catalytic converters, an upgraded transmission cooler, and an engine tune. The car also benefits from weight reduction: The whole car was gutted, taking out everything unnecessary for speed such as the sound system, rear seats, carpeting, bumper supports and more. Even with the addition of a roll cage and extra chassis braces, the car is just over 330 pounds lighter than stock. Handling and stopping capabilities were also enhanced with stiffer springs and thicker anti-roll bars, along with six-piston brake calipers and brake cooling ducts up front. The car also gets visual changes in the form of a front splitter and rear spoiler and diffuser, plus the bold vinyl wrap. Naturally, this isn't a production car, especially with the gutted interior and emissions non-compliant exhaust. But looking at the list of modifications, it wouldn't be hard to replicate the Stinger GT420 on your own. In fact, someone could probably exceed the car's performance, since there are some areas ripe for upgrading Kia skipped over, such as upgrading the turbochargers. Your move, tuners.

2016 Kia Optima 2.0T Quick Spin [w/video]

Kia might live under the corporate shadow of parent company Hyundai, but don't confuse the Kia Optima for a rebadged Hyundai Sonata. That hasn't been the case for years, and the new 2016 Optima is more of its own car than ever before. Yes, both cars share a 110.4-inch wheelbase and 191.1-inch length, two engines, and under-the-skin hardware components. But you wouldn't know they were related just by looking – or by driving. In addition to the 2.0-liter turbocharged engine, Kia offers a 2.4-liter naturally aspirated four on the base end, and a 1.6-liter turbo-four aimed at higher fuel economy. For more on those powertrains, stay tuned for our full First Drive story coming in a few days. My drive time in the Optima focused mostly on the 2.0-liter turbo-equipped version, in loaded trim. Sure, I drove the fancy one, but this car feels so refined that Toyota should be worried. Driving Notes 2.0-liter turbo models use a rack-mounted steering assist motor, compared to the column mounted unit paired to other engines. It's a costly upgrade for Kia, but it offers better feedback and steering feel. Kia firsts include automous emergency braking, and high-intensity discarge headlamps with active cornering and automatic high beams. I didn't have a chance to try either feature, but I can tell you the adaptive cruise control works with minimal frustration. Another new item, first used on the Sorento, is Harmon Kardon Clari-fi digital music restoration, which claims to improve the sound quality of compressed music. I sampled the optional 14-speaker, 630-watt system with some 320 kbps MP3 files over the USB input and was amazed by the clarity and sound quality. The interior layout, with its horizontal swatch of buttons on the dash, is a clean and refreshing. It's a welcome break from more over-styled sedans that sacrifice swoopy contours for functionality. Kia focused on quality materials and feel. The push-button start is metal, models with the panoramic sunroof get ceiling mood lighting with rear LED reading lamps, and top-of-the-line SXL come with nappa leather. It goes a long way to justify the SXL's base price of $36,615. This car is quiet. The roads outside of Las Vegas are smooth, but the desert sun leaves the surface pockmarked. That's usually a recipe for tire noise, but I didn't hear any hum. Kia's product planners gave credit to the Michelin tires. I'll have to sample the car on some worse roads before giving a final impression.

A closer look at the Kia GT4 Stinger Concept

When we named the Kia GT4 Stinger Concept as our top debut at the 2014 Detroit Auto Show, our comments section had, let's call it, a tantrum. People were not pleased. Debuting alongside hugely significant production cars like the Chevrolet Corvette Z06, Ford Mustang, Ford F-150, Lexus RC F, BMW M3/M4 and Chrysler 200 (not to mention great concepts like the Toyota FT-1, Infiniti Q50 Eau Rouge and Volvo Concept XC Coupe), what business did a tiny, turbocharged, rear-drive Kia concept car have winning the prize as the best of Detroit?
Well, as it turns out, it has every right to be there. Our own Michael Harley sat down with the head of US design for Kia, Tom Kearn, to discuss the GT4 Stinger and find out just what the brand was thinking when it decided to create such an enthusiast-oriented concept. The interview gives a great insight into the car and its design, while Harley goes into some detail at the end of the video about why the GT4 was the Autoblog Editors' Choice of the 2014 Detroit Auto Show.
Scroll down to watch the full interview.