My cousins went 15.61@89 with just intkae and muffler..and that is with it spinning BAD! He had a best 60ft of 2.3-2.4 I think. I have raced him with my Probe and he pulls on me pretty good. For comparison..I raced a friends 97 Eclipse RS that has header,exhaust,intake and we were even. They respond well to mods also.. seen some times with just bolt ons as quick as 14.7 @ 92..