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Pat K

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  1. Pat K
    I recently learned about the drone issue with magnaflows cat back kit on the 5.3. what suggestions are there to resolve this. The kit has an 18” center center 8x5 oval muffler and a flapper. installed clean. Looks great. Picks up a low 47-63 Hz in cab drone between 1200 and 1800 rpm. Cruising speed. Gets worse when AFM kicks in. it’s definitely a headache maker. suggestions. magnaflow says add a round muffler as a resonator in front of the muffler

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