Pete I reckon the A1 would beat both the GTR and Porsche, the A1 being alot lighter and with 500bhp what would it take to match it 
Darren
I'd love to see them at each others throats. The brutal power to weight ratio must give some of the supercars a run for their money
Sadly why?
... The only downside is noise, and that can be engineered (new M5 for example).
That's a V8 though - they'd have to do something seriously wrong for it to sound boring, lets face it?!
I stick with my original points about the sound - I think if you buy a premium brand car higher up the engine range, part of the package needs to be soulful acoustics and I just don't think a straight four will offer that, so it would be the respective TDI engines that would take my preference if you're talking 4 cylinders (which will as per usual be slightly more economy anyway I expect.)
