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exhaust cat muffler

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  1. General 6.0L Discussion
    I have an 04 6.0 with a 4 inch exhaust from the turbo back with no muffler/cat. Once the Rpms get to around 2200 there is a serious drone, which is pretty badass, but its starting to get annoying. What whould putting the cat on do sound wise? And what negative effect on performance? I have a cat...
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