Bugatti 16C Galibier -- 4 door race car! Engine is a front-mounted, 8.0L, twin-turbocharged W16 engine that delivers power via permanent four wheel drive -- Comparable to the quad-turbocharged unit used in the Bugatti Veyron. Downside: Still only a concept car.
Nice Concept Cars photos - A few nice concept cars images I found: Chevy Stingray concept car Image by Took a few iPhone pictures of notable stuff at the Chicago auto show. Other pictures from Nikon and Vivitar Ultra Wide and Slim