I agree,thats what I did,I paid a bit more at the muffler shop,but I was in and out in an hour,didnt have to order and wait,plus i got all welded seams instead of clamps

 

I would say go with a flowmaster cat back exhaust #17397. It is the 50 HD series, pretty quite from inside but when you puch it you will surely hear it. Not to mention it is bolt on so install should not be too difficult. Jegs or Summit has it for $399