ACT 07-14 Ford Mustang Shelby GT500 Twin Disc HD Street Kit Clutch KitT1S F11 street, twin disc kit offers twice the number of disc surfaces for better wear, heat capacity and long life compared to single disc kits. These kits use a proprietary Positive Lift Floater System design, which results in quiet operation with no floater rattle and no posts to wear. ACT twin disc kits endure an exclusive four stage, heat treating process on all diaphragms. The ACT twin disc kits features the ability to adjust for disc wear and