you wont get a 12 or 11 sec car out of a na...i have one with like 3 bolt ons and ran mid 14s but there is room for a faster time. Maintaining the z is not going to be cheap...if well maintained the car will be fun to drive. I drive my z daily for over 4 years now with no problems. I've owned 5 NA Z (2 parts cars and one sold) and 1 TT. I love 300zx's they are great cars and looked good also. If you like the z's than a NA will be fine for now.