I called Ron Wood,he sells the dual Keihin 41mm's for little under $800.00 and the dual intake for $45.00(you cant use the single carb intake)This carb is progressive as in the one carb opens then the next,not both at the same time.I still need to find out if this carb set-up,or the one Team-Pami offers(Mikuni racing carbs)clears most aftermarket pipes?If doesn't clear the Graydon maybe the custom-x?