Fubar,
I can't give you any info about the Xtremeflow muffler nor about their claims of hp/mpg gains. You may or may not see noticeable improvements in hp/mpg; it really is vehicle specific.
Corsa is the ONLY GM licensed after market exhaust and can not be used as an excuse by GM to void your warranty.
After ALL the mods that I installed, I saw about 1 MPG gain. The truck gets driven about 80 miles per day - a combination of Hwy and stop/go traffic. It use to average between 12.5 and 13 mpg on a tank of gas. It now gets between 13.5 and 14 mpg per tank. However, the mpg gains will never justify the cost of the mods. I did them because I wanted to.
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Yellow 03 Adventure w/black Grill, UM8 Touch Screen Navigation Radio, U2K XM Digital Radio, Remote 6-CD Changer, JBA Titanium Headers, Corsa Off-Road Sport, Airaid Filter & MIT, Nology Wires & Plugs, S&P Pro-Flash, Warn 9.5ti w/X-Line, Toyo Open Country M/T 37x13.5.
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