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Bobstoy 53

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  1. Bobstoy 53
    Has anyone tried just replacing the muffler and leaving the flapper and resonator ?
  2. Bobstoy 53
    Hello, new to this forum. Recently purchase a 2016 GMC 35K with the 5.3 engine. Just to give a different point of view from the posts i am reading. My truck shifts so smooth you cant feel unless you are watching the tach. It also changes in and out of 4 cyl mode where you cant feel it. I just took a 100 mile trip and averaged 20 MPG in 15 degree temps. So i am happy with my AFM.

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