speed on straights. they're about the same. raced a friends gtt the other week. he beat me just. i say each to his own. im a nissan nut so i bought the gtr. if ur looking for a skyline just for looks and streetability, go the 34. i get about 3-400km's per tank. and with the coilovers its a rough ride. but i do like the attention i get for owning it. no cops yet (touch wood)