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I'm not expecting much, but will Pypes mid mufflers give me anything in terms of HP gains? AM says that they will, but I've never even thought about it. Will I see anything at all?
From: PA to KY ('07) to IL ('09) to MS ('10) to FL ('11)
Nope. Any gains are so "in-the-grass" that you can't tell them from a dyno's pull-to-pull variance. The stock exhaust from the H-pipe on back flows quite well. You'll gain exhaust note (which the brain can play games with to make you THINK you're faster).
The sounds pretty legit. I have them and really enjoy them. I can't wait to add my lt and o/r h pipe as well. No horsepower gain just from them though.