Off road x-pipe question(s)
So i'm seriously considering picking up a NON catted off road x pipe... I have a couple questions though
1) I don't want a CEL. Do i HAVE to have a tune to get rid of it? Or is there some other way?
2) what the power gains look like? 5hp? 10? 15?
3) With stock exhaust other than the x pipe, will it be obnoxiously loud?