Originally Posted by Krio

The stock slipper uses one pad for the front and one pad for the rear. There just isn't enough friction for the rear when on power, so it ends up slipping and overheating with high torque motors like the pro4. The clutch basket adds another pad to the rear for more surface area/friction while the Garodisks have a higher coefficient of friction and don't require maintenance (the stock pads require re-scuffing as the face of the pads polish themselves against the aluminum plates over time). To have enough friction to properly get the power to the ground you only need one or the other, but you can also use them together.