Ok, my present 03-A has V&H Powershots with a Power Commander. It seems to run as well with a 30 tooth sprocket off the line as my last 03-A did with a 28 tooth sprocket while equipped with a CFR and gil's box. Both bikes had K&N filters (my older bike was topless, current bike not topless) I never put either on a dyno so I cant compare actual figures. My question is, what pipes installed on a stock motor and properly tuned with a Power Commander or like fuel management system produces the most HP. I have read post's saying some pipes actaully reduce HP. Just curious due to the noticeable difference in peformance between the two.