By the way the Borla makes more HP than a straight pipe. Straight thru mufflers that are perforated have minimal loss of power if at all. Ones like the horrible Flowmasters with their baffles hurt power but guys seem to like their obnoxious sound. PYPES are terrible also. had a set and took them right off. I have reasd where the borla's help loe end torque and torque is more important to HP for me. Thanks