trak560-
My vote on the best sounding muffler is the Walker Muffler which you can buy at Napa for $89 ( # 21471). Its a straight through 4 inch muffler that has no packing. Note: I dont have CAT with my set-up ..... as I am currently using the test pipe ... ..... again strictly for testing only. The muffler has a real nice tone while idling and then will wake up when you hammer down on it. I am also impressed with the turbo sound I am getting with this muffler. I have used this muffler on my previous Dodge trucks and can tell you my 1999 truck sounded the best but I am pleased with the sound of the 06!!! Based upon the price I would at least try it out. Let me know what you decide.
My . 02
Southbound