The biggest benefit of the ACT 4-Puck Solid Hub Race Disc is it enables extremely fast shifts thanks, in part, to its reduced inertia. An ACT R4 race disc friction surface has good durability but will have shortened spline life. ACT designed the R4 for a heavily modified drag race or road race cars where extremely harsh engagement and clutch chatter is expected.
Both the G4 and the R4 are available coupled to the Heavy Duty pressure plate for a 41% increase in clamp load, or the Xtreme pressure plate which increases the clamp load by 57%. The HDG4 is the most streetable 4-Puck combination (but not suggested for any vehicle that is daily driven) while the XTR4 is not streetable and only recommended for track applications.
Torque Ratings: HDG4 & HDR4: 651 ft/lbs
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