[JAG]

I'm not sure how everything works technically but this is what I've read about the situation.

The 2002 R8s had around 660-70BHP with smaller LMP900 restrictors than the LMGTP Bentley, which was producing around 640BHP.

The 2002 Bentley was 4000cc but was clearly (and some say purposefully) not as high a spec as the Audis engine.

Ulrich who runs Audi says the 2002 R8s have had no development to the engine and is now producing around 600BHP. The Bentley however has a completly revised, 'ultimate' spec. engine that he says gained back much of what was lost by the 10% smaller restrictor plus some more.

Looking at restrictors in the WRC, the cars only have 2000cc and produce around 350BHP but have manged to gain around 30BHP in the last 4 years or so from a starting point of around 315BHP.