you will need a muffler with 3" inlet and dual 2.25" outlet
the Borla Pro XS 400486 is a perfect diy muffler. all you need is the muffler, a 3" extension pipe (around 17"iirc), 2 3" accuseal clamps and 2 2.25" accuseal clamps
if you are on a tight budget, you can grind off the weld on the...