MitsuStyle - View Single Post - Square exhaust tubing is NOT better than round.

FattyBoomBatty · 06-23-2008

Runner size can be important in a high powered car, or one where there is a lot of exhaust per cylinder. If you go too big, the exhaust will tumble over itself creating backpressure. In a square tube, that type of thing would seem almost unavoidable, given the shape of the corners. I do know that if you slightly flatten a round tube (make it an oval), the flow capability goes down.

06-23-2008	#10
FattyBoomBatty Banned Join Date: Dec 2003 Location: Boulder, CO Drives: Conquest Posts: 5,049	Re: Square exhaust tubing is NOT better than round. Runner size can be important in a high powered car, or one where there is a lot of exhaust per cylinder. If you go too big, the exhaust will tumble over itself creating backpressure. In a square tube, that type of thing would seem almost unavoidable, given the shape of the corners. I do know that if you slightly flatten a round tube (make it an oval), the flow capability goes down.