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Old 04-29-2014, 07:56 AM   #3
CC69Rat
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Join Date: Jan 2011
Location: Chattanooga TN
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Re: Magnaflow XL mufflers - yay or nay?

Loss of back pressure will cause power loss. IMO it's the 2.5" change, not the muffler. .. but it could be the free flow design of the Magnaflow that contributed to it too. Regardless of what muffler you chose if it has a free flow design (Flow Master, Borla, Magnaflow, Spin Tech) it would have done the same thing. Just my .02
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