One of the last things untouched on my 800 is my downpipes (or Headers as you Americans say) I did my 1200 and the throttle response improved a bit, but I did add a techlusion controller. The question is "is there any noticeable gain in performance, smoothness, economy etc?" to warrant paying all that cash? Would I need a fuel controller or would the alterations be within the ECUs range of control? I know there is a weight saving but lets be honest, you could eat less pies to get that small amount off. Also which ones, Arrow, Remus, QD :eek1 seen the price of them babies!!