2014 Jaguar XKR-S GT at the 2013 New York Auto Show

The game of supercar one-upsmanship continues between the world's leading luxury automakers, and Jaguar has fired the latest shot with the unveiling of the new 2014 Jaguar XKR-S GT coupe. A track-ready but street-legal road racer, the new Jag builds off the super-fast and ultralight XKR-S coupe with the addition of a host of carbon fiber aerodynamic parts and suspension upgrades.

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The most obvious changes are to the body — there's a new carbon fiber front air dam, "dive planes," wheel arch spats, rear wing and rear diffuser to increase downforce to a maximum of 320 pounds at the car's top speed of 186 mph. It's also got a carbon ceramic brake system and a race-derived, height-adjustable twin-spring suspension system. Jaguar has replaced the front and rear suspension arms, uprights, wheel bearings, bushings and the car's rear subframe as well.

This is not purely a race car, however, as the interior is still very luxurious. The cockpit is finished in charcoal-and-red leather and suede cloth, with embroidered Jaguar and R-S GT scripts on the backrests. The XKR-S GT comes in any color you desire, provided you desire white with black racing stripes.

Production will be limited to just 30 examples for a few lucky North American buyers — 25 for the U.S., five for Canada. But at $174,000 (excluding destination), it is unlikely that they will be topping anyone's best-seller list anyway.