I just got my 525 XC last week and am already starting to think about an aftermarket exhaust. I know the engine has a lot of potential but it feels more corked-up than I thought it would, but maybe that is because I'm comparing it to my tricked out Raptor and LTR. Has anyone tried the Akrapovic slip on or full system? If so, I'd appreciate a few comments on the performance gains, especially since they want $750 for the silencer and $800 for the header. I've never see a full system cost that much--perhaps it is the low dollar. For that much money it had better be good.