Hi,
I have a 2004 DC and one of the first modifications I did was to the exhaust. I had the stock muffler removed and installed an Aero Turbine, 2525 resonated model. At the same time I had the stock resonator cut out. The sound was awesome but removing the resonator was a mistake as it created unbelievable/unbearable in cab
drone. We solved this by installing a glass pack in the location where the stock resonator had been. I wrote a thread about my experience
Aero Turbine Exhaust
Just recently I had a split-y installed at the outlet of the Aero Turbine and dual pipes run over the axle to the corners of the rear bumper. I have to say that I think I have finally achieved what I set out to do with my exhaust. The sound is just great. The glass pack took care of the drone and gave the system a nice rumble. The fake duallies (foolies) really augment the sound quality while making it look very cool. I love the sound. I am 40 years old and gun it every chance I get just so I can hear it. My cheeks hurt from grinning and I feel like I am 17 again.
I do not care if it is a mid-life crises - my exhaust still rocks.