Nope. Stuck with a muffler. You could ebay one for about $40. Get someone to cut your old one off and clamp it on. It might look better and sound a little different... but bigger exhaust pipes won't really help. If you do find a cat-back, it won't do any more good than just a muffler because of restrictions up-stream from it. It would be easier to install, though... and have all the right hangers.