if you want a great sound with no drone...go with the magnaflow 6 inch race series...with 3" inlet and 3"outlet...I had the 16 inch magnaflow 3 inch inlet 2.5 inch dual outlet..not loud at all until you get on it...the race muffler by far has the best sound I have heard..if you want great sound and flow go with a magnaflow..if you just want sound and less flow and drone in the cabin go with flowmaster...I've had them both.
and yes I went back to a single exhaust sounds better and my tahoe loves it with the new K&N air intake the tahoe is a whole new beast...have the magnaflow 3" inlet and 4"outlet exhaust tip as well...good stuff man!
if you go into my profile you can see the old exhaust with the dual tips coming out the back