I would like to say yes per the butt Dyno. But with a side note of it was just a part of fixing multiple issues. I also replaced the whole exhaust. Cheap stainless exhaust manifold, Walker down pipe, added a piece of flex pipe, Thrush muffler,& Walker tail pipe. The manifold was also replaced because it was cracked and one of the students was broke. With all that who really knows if the pipe made a difference?