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Thread: 2006 5.9L Cummins - Strange Puffing Sound

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    2006 5.9L Cummins - Strange Puffing Sound

    Truck has 153,000 on it, has a 4in straight pipe I just got it yesterday and I decided to take the muffler off and it sounds odd to me kinda like a puffing sound has me worried.

    It also makes kind of a tapping sound under acceleration.

    It seems to be running fine though oil level is good but does need to be changed.

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