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Are you going to keep the stock tailpipe location? If so you could just swap in the muffler of your choice.
I hate single tailpipe exit and i always put duals on all of my vehicles. I just think it looks much better.
I just had a shop install a custom dual side outlet on my yukon. We went with stainless three inch pipe from the cat to the muffler and two and a half inch tailpipes and three and a half inch tips with a flowmaster 50 series deltaflow muffler.
http://i139.photobucket.com/albums/q281/Sasquatch769/IMG_9297_zpsfd7bd07e.jpg
It`s loud but at normal cruising speeds it`s not bad inside the truck.
Here`s a horrible video my girlfriend took of my truck doing a fly by but the sound came out great.
http://s139.photobucket.com/user/Sasquatch769/media/MVI_9340_zpsea697306.mp4.html
^^^ that clip sounds badass man!