Very nice you made this comparision. Now I can propose mine.
Audi S5 V8 (4.2l V8 FSI 354 hp) or Audi S5 V6 T (3.0l V6 TFSI 333 hp)?
BMW 335i (3.0l I6 FI 306 hp) or BMW 340i (4.0l V8 NA 306 hp)?
Even if the S5 V6 T may be better than S5 V8, I prefere the V8, for the sound, it make the car more special, in this case more special than BMW 335i, and closer to the BMW M3, also in terms of exclusivity. As for the 3 Series, I also would prefere the NA 306 hp 4.0l V8 from the BMW 540i than the FI 306 hp 3.0l I6, as is would also be more special, you have a V8 in a 'small'. Of course many think it may not do much sense as there is the BMW M3 that has a H-R NA 4.0l V8. But between the Audi S5 V6 T and the BMW 335i, the Beamer is more special as it has I6 and not V6.
Anyway, imagine a 3 Series Coupé, that does not look as special as an M3 and is not a head-turner, but has a great V8 sound, which will surely make it a head-turner: What engine has this 3 Series Coupé? Strange, but it's not an M3!
