Ive searched a bit but cant really find a definitive answer. I just bought stogges springs from him and its a 07 z and I have a non sport from what I can tell 03 sedan. all ive seen was that the performance will suffer If I just install the springs? how so? all I'm really looking for is roughly a 1 inch drop and a ride quality thats relatively the same. can someone clarify? thanks

Your shocks will not last very long due to the revised spring rates and your car is older so your shocks are probbly near the end of their life anyway. I would get 350z shocks if you install the springs. Also, you have a non sport and the 350z revised springs are alot stiffer (308 lbs g vs 427 lbs z in the rear) so your ride quality (smoothness) will go down.