FPP B-PIPE HANDS DOWN. the website claims it adds like 19 hp to a fx-1. i dont know how true that is though. it has a higher resale value. everybody runs them for a reason, cause they work and they can take the punishment. personally i just like the way they mount. they are tucked on the side of the engine bay and makes it look alot less cluttered. i wouldnt want an exhaust that mounts to the head. hurry and order one from fpp before they are out again