Originally Posted by swansong
Off Road Pipe. Replaces the catalytic converter with essentially a straight through (but curvy) pipe. Not exactly legal, but if you don't have emissions testing you should be ok. Another option is a High Flow Cat, or HFC, which costs more, but still gives positive gains over the stock cat. And its legal (in most states/applications)
Hmm, well thanks! I learn something new everyday on here lol. I probably wont be going with an ORP in that case.