Originally Posted by Red__Zed

You shouldn't change anything on the car without modifying the tune. I'm not a Stillen backer in anyway, and have generally been unhappy with how they handled the supercharger deal, but this is owner error. Changing headers certainly changes the tune enough that you should not be driving on it, and definitely not making a pull.


On my S2000, the IP exhaust I had on it separated, causing an exhaust leak. The leak altered my AF readings enough that the car would have done the same thing if I had run it. That's just how FI applications are.