I moded my variator , on a downtown 300i the sides are 1/4 inch thick, and you don't take out the sides of it, you just file in the slope a little longer, and use Dr. pulley sliders, 15 grams ,. it lowered my rpm 1,000 rpm at speed, 60 mph. and up over 70 mph. it lowered rpm by 1500 rpm. at 60 mph. 6,000 rpm at 75 mph 6500 rpm to 7000rpm. depends on head winds and hills,. at 7500 rpm. to 8000. rpm 145 km. to 150 km per hour that,s about 94 mph