friend plan to drag race, go with 6puck. They can take the abuse of launching on them with sticky tires. The street disc will just glaze over and fall apart. otherwise, stick with street disc for smoother engagement. rps max serie clutches are good but from what I was told southbend is better. such as stage4 ofe or stage5 FE (great for drag/ street racing) and they also have 6puck.