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Power Strokes
6.7 Aftermarket
deelete pipe back exhaust
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[QUOTE="doo dah, post: 1499210, member: 22536"] I have 5" exhaust and 4" aftermarket downpipe. Started with a muffler when I had factory turbo and switched to straight pipe until the Rick Flair became annoying so I went back to the muffler. After going non VGT I pulled the muffler again until the noise and drone drove me nuts so on went the muffler again but no real improvement. I now have a 42" (I think) Donaldson and love it. Quiet as stock inside with no drone and outside it is unique. It turns heads and really brings out the whistle from the turbo, sounds like a 6.0. I recommend it to anyone that wants good flow but wants to keep the noise outside the cab. Never had it on with the factory VGT though so I can't say what that might sound like. [/QUOTE]
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