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I just put the GM chrome tip on the end of the stock exhaust. It doesn't look too bad. Sorry no pics yet.
Maybe you'd like something like this? Good tone but with no in cabin resonance.
http://www.lmperformance.com/53163/.html
I have the volant resonator delete kit gave the denali just a but more rumble with an outstanding look and the price is great too at just over 100.00 shipped. I will post some pics of it on the truck come sat