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    Magnaflow vs Flowmaster - mufflers only

    I just had the MagnaFlow #13259 muffler installed on 2011 5.3L GMC Sierra Crew. I kept the stock exhaust (muffler back) and the resonator. I love the sound. I don't like the drone from about 1700-2200 RPMs when going through the gears. It can be kinda annoying. Maybe it'll grow on me...

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