Originally posted by eclipsegst303
well the ehaust couldnt really have messed up anything by itself. But maybe when u were installing it, u forgot to hook up a sensor or something little like that. With ur new exhaust ur car should have been plenty faster. But if u really think it is the 3" system, put ur old one back on, and see if that fixes it. If it does, ur car is a freak.
+1 make sure your o2 sensor is connected
