The V12 will be crazy in the Q7 and Grade-A insane ... At first glance, you'll hardly be able to tell a difference between the 2007 Audi A8 and the testing mule you're staring at here.

However, in the late 2000s, Audi toyed with the idea of putting a twin-turbo V12 engine in the Audi R8. The proof of concept was a model called the Audi R8 TDI Le Mans, and it envisioned a crazy ...

this time of the next generation Audi A8 due out at the end of 2009. Reportedly three inches longer than the current A8, the next gen model will feature V12 diesel and V10 gas powerplants.