My setup cost me $200........flowmaster original 40 off ebay for $60, and having it hung and new 2.5" piping was $150. Prices depend on the muffler shop....some think their stuff is gold, some give ya a good deal.
But if you don't want to spend that.....get a 2" side/center muff, some short pieces of 2" exhaust tubing, and make it work. Use a welded or just clamps. I believe the muffler length and the stock muffler are different lengths, so you'll likely have to add some pipe.