Anybody got any ideas for a muffler swap on an 04 Dodge Cummins. Looking at my truck I would swear I've got a 4" exhaust, but after reading numerous threads one here, it should have a 3.5" exhaust. It's got a build date of 4th Quarter 03. Anyway, I'm looking to just swap the muffler for a good performance model and don't want to straight pipe it as I routinely drive 900 mile trips twice every 6 weeks - need to hear my Sirius Sat Radio. Any help would be much appreciated.

 

look on the side of ur valve cover.. if it says 305hp at 2900rpms then it will have the 3.5" if it says 325hp then u have an 04.5 and have 4" exhaust

 

It is an 04 (build date is last quarter of 03), but it's got a 4" stock original exhaust system on it with no cat. I've got some sort of half-breed, mutt of a truck. When I originally bought the truck, I had trouble registering it because the VIN didn't compute as an 04. The other thing I've been told is it is basically a 3500 series but is listed as a 2500. I've got one ton springs on the thing. I'm thinking that as it came down the assembly line it was put together with a mix/match of parts before they switched over to the 04.5's. Damned if I know? Anyway, about my muffler question.....

Seriously, an tips, pointers, "I wouldn't do that if I were you"'s would be greatly appreciated.

 

Put ya a good 5" mandrel bent system with a muffler on there.

 

donaldson makes a great muffler that sounds very good but makes the cab interior very nice. heres a vid of a guy with the 4" donaldson muffler through a stack. its a very tame muffler

 

I used a 30" Magnaflow on mine...no drone and I routinely travel cross country as well.

And that's with a setup similar to yours...4" pipe with only a muffler (no cat).

 

Your down pipe is 3.5', but the rest of the exhaust is 4".

 

:upup:

 

I have a Pinnacle Power system.. I love it... check them out.. do you know the name "Jardine Header Co." from the 60's and 70's??

Pinnacle Performance Diesel Exhaust Systems

 

what does everyone think about the silverline mufflers?