Yeah, I got that it was ranked by power, but didnt realise it was actually done by bhp/tonne! Doh!!!
Anyhow, just noticed that bhp/tonne of a V6 is 230/1335kg and the Cup is 172/1021kg which are nearly the same! (172 bhp/tonne for V6, and 168 bhp/tonne for Cup!) Wow! If you take out some other unnecessary stuff from the cup (like the lights, wing mirrors, roof aerial, etc), itd have the same power/weight! Still prefer a V6 though!