I would have a shop custom mandrel bend your pipes from the cat to the rear and then put a MAC Flowpath muffler on it. you can get them in polished stainless steel, but they are not canister mufflers like all the ricey ones. They are made for camaros and mustangs, so the baffles inside are tuned differently and sound way throatier on smaller engines. good power too. The muffler is only about 13 inches long by 8 or 9 wide and they cost about 85 bones. That's just what I'd do, but I'm not conventional so it's all good.