Clutches can be temperamental, but we've had excellent success with ACT over the 20+ years we have been using them. They work well and have an incredibly low rate of issues, and in the rare times where we have seen flaws, ACT is the best in the industry to take care of the customer. They are our first line of clutches when it comes to making reliable power. HD units can take up to about 300 torque in our experience.. We have pushed more than 450 torque without issue on the puck clutches with the Xtreme pressure plate. We strongly recommend a Verus Clutch Fork upgrade to complement any aftermarket clutch as the stock unit will eventually bend causing difficult engagement.
HD - Heavy Duty - Lighter pressure plate, slightly heavier than stock. Stock like engagement.
XT - Xtreme - Heavier pressure plate, has a harsher engagement but can take more power.
Puck Style - Harsher engagement, can take substantially more power.