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  1. Exhaust necked down?

    LD RAM - General Discussion
    Recently had a Magnaflow muffler put on my 2007 Ram 1500 5.7 Hemi... Question is... The place where I had it installed necked down the exhaust from 3" to 2 1/2" before and after the muffler. The Magnaflow has a 3" inlet and outlet, so I saw no need to do this. Their explanation was that it...
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