Mark,
Generally with aftermarket mufflers, you get more flow and less backpressure. This can sometimes hurt midrange torque, but usually a muffler change alone will not effect power too much either way. People that claim 15hp gains from just changing the mufflers are "selling" a product they want you to buy.
I don't think my modification would be a good choice for Top Speed mufflers. The mufflers need to have some back pressure for the bypass pipes to work efficiently, and I believe the Top Speeds would not have enough. If you still have your stock muffler, I cold definitely work with that.
Darin
Last edited by FisterD; 01-07-2009 at 07:49 PM.
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