Autoweek and Fourtitude were able to enjoy some seat time in the Audi R8 V12 TDI LeMans concept before ... that the transmission mated to the engine is an A4 case with modified internals.

There's no denying that Audi is planning more variants of the TT and R8, but most of the speculation revolves around fitting both models with high-output engines ... mention the V12 TDI mill.

Audi has done many crazy things in the past, but putting a twin-turbocharged V12 diesel engine in the Audi R8 might take the cake.