The exhaust is designed to go straight onto the bike with a bracket to fit onto the valve motor to fool the ECU into thinking it is still functioning correctly. This keeps the light out. The fueling corrects itself enough to run without further mods and it gives it an extra 6 hp. The only thing I would say is that it is LOUD! There are two versions available and mine is the non silenced one with an excuse for a baffle in it!
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