I've just ordered from the US the new Powercore IV(2) and High Flow header for my '99 WR (hopefully it will arrive in time for the Isle of Man at the end of May - if you haven't been, you don't know what you are missing!!) Has anybody tried this set-up, and if so what carb and jet settings have people had success with? I'm awaiting a reply from the tech guys at FMF - if its any good i'll let you all know. One last question, what are the general recommendations for decent 'bash plate'? My frame rails are beginning to take a battering. Look forward to hearing from you.