Attention: TDR Forum Junkies 
I love my 04.5 truck, done lots of modifications to it for better towing performance. One of the first was a MBRP turbo back exhaust system. The only downside is that there is a more throaty exhaust note that tends to get a bit tireing at the end of a 10 hour driving day. I installed a second MBRP muffler in place of a small resonator, this seemed to help some. Just as a experiment I took the short resonator and installed it on the end of the exhaust tip, WALA!!!! The deep resonance is GONE!! Looks kind of funky (like the kids ricer car exhaust) but really seems to do the trick for noise. I am going on a 600 mile towing trip tomorrow and will report how it works.
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