its complete crap. have you seen any top level competition engines ie GP kart ect use such a "mod" no you dont why wouldnt GP engines use this you say? because its crap. top level kart and gp engines do there best to shield the incoming intake charge from hitting or getting near the crank at all. they have castings that cover the crank where only the rod pokes through. I have had the privilege to talk with some of the best two stroke engine builders in the world and they all agree its not worth it in GP or any venue.
