Exhaust recommendations.

[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

[T1Kaiju]

Got a Corsa Sport put on today, and I absolutely love it. Sounds very vet-ish with my airaid jr mit set up. Take your foot off the gas (hard to do, really) and its gone. Cant hear it at 80. Ive had flowmaster, magnaflow, and glasspacks in the past - they all drone at highway speed. Corsa does what they say they do and ARE MADE IN AMERICA. Life's too short for ******, and you do get a lifetime warranty...

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