Seems both are 12 1/2 to 1 .Supercharging in question. Back to square one...Maybe nitrous for a super launch or... extra oomph to get into 200 MPH club. Where to put the bottles?? And I read that the 8 cyl engine is identical to the V10 with 2 cyl. chopped off. Sharing of parts possible. Audi developed the V 10 technology for Lamborghini back in '04. So those extra ponies cost 40 G.