Lamborghini Murcielago RGT
The Lamborghini Murciélago R-GT is the racing version of the Murciélago, developed jointly with Reiter Engineering and Audi Sport. Unlike the standard car, the R-GT is rear wheel drive only, in order to comply with the FIA, ACO, and JAF rules. The car retains the standard V12 engine, but air restrictors are used to manage power. Acceleration and top speed performance are dependent on gearing, as different ratios are used for different tracks.
A version of the R-GT built for the Japanese Lamborghini Owners Club to compete in Japanese Super GT series (JLOC). In March 2006, an RG-1 recorded the first victory ever for a Lamborghini when they earned a win in the GT300 class at the Super GT Suzuka 500 km.
Source: Wikipedia, 2011.