Sweet. RC51 is one of my favorite sounds, and I almost bought a Superhawk because of this. It will sound great with properly packed straight-thru mufflers, and will take the annoying rasp off that I'm sure you have now. I bet performance and throttle repsonse will be improved also, as a tightly packed perf tube is pretty much a straight pipe as far as exhaust flow is concerned, and what you have now is just a mess.