I have the same truck. the exhaust on the sports are made of 409 stainless and great quality. Just replace the muffler and possibly the Y pipe and save yourself all the money. Got mine done at a custom race performance exhaust shop. Cost me $225 for a 14" magnaflow fully welded on. Makes the truck sound awesome but not to loud.
Thanks for the advice. I was thinking about a MAGNAFLOW DIRECT-FIT MUFFLER KIT if this possible and if yes what is the part number and do I need more extra parts than a MAGNAFLOW DIRECT-FIT MUFFLER KIT to installed it myself. It is a dual exhaust.