Guess who owns Infiniti and builds their engines? Nissan. Anyway they just max those v6's out and there isn't a whole lot of room for play.

The guy that works on my cars (owns his own shop, restores old vehicles around here) and I quote "The interior has the Lexus beat." - He said this about my mustang.

EDIT: Lastly, I'd never buy foreign. If you want muscle and luxury nothing beats the fastest sedan in the world, the Cadillac CTS-V with 556 Horsepower.