The m3gtr is powered by a ex f1 judd motor , it must have been cheaper to have the same power as the expensive DTM bmw engine . Its down tuned to over 500hp from memory .
Mmmmm.... . . De-Tuned to over 500hp !
Yeah, I think I read somewhere the mega-6cyl's He was using were costing too much to build and re-build all the time. Ironic that He puts in an Ex-F1 engine cos it's cheaper to run !
I think they're allowed to run bored, stroked de-tuned 3.5 or 4 Litre motors in Historic F1 racing series to keep costs down - Maybe it's one of these?