Umm... a quick guess off the top of my head (if R32 isn't the correct answer that is) would be the Nissan GT-R R35 SpecV, a true track monster dethroning many more powerful and lightweight vehicles, an engineering marvel
YES! GODzilla AND it shares name (the wtf moment Zonda C12-Callaway) with not only one, but two cars also found in the game: Golf R32 and Celica GT-R apart from the other Skylines. Good job
Ah yeah, it wasn't that hard. I guess everyone else just thought too hard about it, haha Anyway, 24 hours have passed already, and even though nobody has posted something yet, i'll give it to someone else. Can't really think of anything from the top of my head.