Which goes to my main question, any idea what size pipe i would need? I have been scouring for what seems like an eternity and i can not find a straight answer. I've seen 2.25", 2" and 2.5". Like i said, total car noob. I am not going to get a new cat, i would rather go the straight pipe or DP method, which ever works better and won't cost an arm and a leg.