Originally Posted by whats77inaname
Does your car have a tune? Is the check engine light on? Recently bought a catless STi in from FL, and it passed w/out an issue @ a nat'l chain. As long as you're OBDII and not throwing a check engine light, and haven't recently, you should be fine. So I'd suggest you hit up Mike Benvo.
If not, put your stock exhaust back on and drive the car until it recalibrates and the check engine light disappears.
The light is not on when im driving, only when the car is to be inspected than they see the engine light on, but I'm not sure if its on the car or on theyr computer. Ive never seen the engine light in the car pre/post inspection