As mentioned in a few other posts, if you have both the pipes and intake installed you NEED to have a fuel kit as well. If I intake more than I can exhaust I may cause engine dmg. On the other hand I COULD put an exhaust on there by its self, with the small down side of more backfire and some popping sounds. No reason to intake what I cant push back out, and at the point I can Ill need to have the pro tuner anyway.