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Discussion Starter #1
There is what looks to be a muffler over the rear axle on my cummins. What is this?
 

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Yep you guessed right it's a muffler.
 

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Megacabs have resonators.
 

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Discussion Starter #4
I was wondering because one of my friends has an 06 QC and he cut the cat and installed an aftermarket muffler and it's alot louder than mine. How much louder would it be if I either cut the resonator or cut the mbrp off.
 
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