HAHAHA, When I was little I used an end of a leaf blower nozzle as ram air to the filter. I also had a glass pack on it as well as used a bicycle kick stand mounted to the frame that had a fishing string attached to it that went back to the govenor, so once you hit max speed normally you push down the kick stand like a thruster and get another 15ish mph. I called it the turbo booster. Though ghetto fabed, it was the only gokart in the neighborhood that could hit 40mph.