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I stopped by my local exhaust shop to see about a new system, I was told I would have to have a muffler due to Utah inspections, I was told that when the truck regenerates it can have temps over 1500 degrees, and this I have an ugly exhaust tip. I just bought this new LMM duramax so its all new to me, I had a 02 duramax. My question is, I looked under the truck and it appears that there are 3 mufflers, I know they must be something else but Is there really just one in teh back under the bed?
 

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i would look into the state laws for diesel trucks and go from....
 
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