After its debut season last year, BMW's Z4 GT3 racer is back this year, albeit with a few modifications. Taking into account its strengths and weaknesses, the main area of focus to improve was in aerodynamic efficiency. Engineers also added a new generation ECU engine management system and gearshifts are now initiated with paddle shifters. The car's safety cell is composed of extremely rigid, precision steel tubing that's welded to the body.

Front and rear wings, hood, roof, fenders, and numerous other components are made of carbon fiber reinforced plastics. The 18-inch wheels are made from forged aluminum and contain a set of aluminum brakes. For those wondering if their production car can handle the GT3 circuit, you'd better think again, as the main difference between the GT3 racer and the production model is the engine, with former powered by a 4.4-liter V8 and the latter by a six-cylinder unit. The 2011 BMW Z4 GT3 goes for about $456,230 before taxes.