[SLESTAK75]

I've not tested yet. In order to change grooves you must remove the cover that has the spring seat on it. This was no easy task it's on there very tight. I head to pry and pry. Then you remove the 3 pins and spin the pulley till the pinholes line up with the other grooves and reassemble. Also not easy. Did you match your intake and exhaust to the ports on the head? This could give you the extra power to open that pulley on up. The belt does go deeper into this pulley and that will give more top end. It's just a matter of getting it tuned to squeeze that variator together. I don't have the dr2 but I'm running 11 gram sliders and that works good for me.