Never had the RSR but at the time I was looking for a new exhaust, it was not available so I went with th WS. Got my cat-back for $390 shipped and I have no complaints. The canister is blinging but I plan on painting it black. I've had cops next to me while I was going down the road @ 5K RPM's and they didn't even look over. I got 3 noise violation tickets with my old Tanabe RM, with my WS, I don't think I could get a noise violation ticket if I tried.