I have a 98 GSR with aem cai, greddy sp, dc 4-1 header. I made my first trip to the track last night and my best run was a 15.8. I wasnt to dissapointed, it was my first time and a i had a 100 pound speaker box in the back. But now i am hooked, it was quite an experience, and since the bakersfield track does street legals every friday night, im gonna be there every friday night. next time i go i should have my full 2.5 exhaust, fresh plugs, oil, and cleaned filter.