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i love the NPP. i NEVER have the valve closed though, so that makes me think that if i didn't have NPP, that i would be just as happy with a MBRP style exhaust that's straight pipe with J's to reduce drone.
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2017 NGM 2SS NPP M6 MRC Vortech SC, 2" TSP LT No Cats, Borla X, Eibach,
Hurst shifter 603hp/547tq |