Got one on my '03. The bike is certainly not restricted any longer. Seemed to make the bike more responsive at lower RPMs, but this isn't always a good thing. It was almost an annoyance in NC on the twisties-required a very steady hand, or the power would come on abruptly. Causes some idle quirks as well. You should talk to Johnnycheese about options, I will probably do something different in the future, but for know I'm sticking with my TRE.