One other possibility if you're on a budget is Kteller. They sell bolt up piping kits and mufflers. Assuming you're not running a whole ton of motor, a 2.25" stainless piping kit with 14" resonator is $330 and a 2.25" stainless oval muffler with 4" angle cut tip is $100, for a total of $430. That's about $90 cheaper than RS*R and about 40 bucks less than Tanabe.