last weekend i raced my buddies 350z from a 40 roll. he has the nismo intake and i was stock at the time. i was in 2nd at about 3.5k and when we took off i hung with him for about 5 sec. until he put about 3 cars on me. so then next day i put on some gt spec headers w/ uppipe and a perrin dp that i bought for $300(a steal i know).
then fri. nite we raced again from a 40 roll and this time i jumped out to a half car lead until we finally shut it down at 120.
i knew that these cars responded well to mods but i was shocked at how much of a difference it made.