what about a twin pass muffler, its still straight through and a little quieter. probably the cheapest way to go about getting a 2.5 inch exhaust is buy the piping from kteller.com already bent, about 300 shipped. It is a full slip fit exhaust system from either cat back or header back, great quality and fitment. Get a muffler shop to weld up a muffler of your choice to it and your done.