I put a aero-turbine on mine, it's pretty quite untill you get on it, even then not bad in the cab. A buddy of mine put one on his 5.9 and its way load all the time, don't know why theres a diffrence between the 6.7 & 5.9

 

it seems like the brand new 6.7ls and even later 5.9's arent loud at all. not even close to the old 12 and 24 valves

 

I ran my exhaust for awhile with the mbrp muffler, prett quiet in the cab but outside it was still descently loud especially at wot

 

thats exactly what im looking for. quiet in the cab and loud outside

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should i go with a muffler or a resonator? the resonators ive been looking at are 4" in and 4" out and has a 12" long body. would that be a good suit?

 

If you have a 4 inch then magnaflow migt be able to help you out. They make one that's realy small in a 4 inch. It's in there race muffler section of there site.

 

Glass Pack

 

Second the MBRP's. Mine is the just the add-in muffler and I like the tone. Doesn't drone much either pulling my trailer.

 

That's kind-of hard to do with an I6 diesel engine



as far as the glass-pack style mufflers go, the longer the better for sound control (they are the cheapest)

 

4" glasspack! sounds sweet at a fraction of the cost. ran it on my 89 forever and it took all the harshness out of the exhaust.

 

straight pipe only way for a cummins