ACT Twin Disc Heavy Duty Race Clutch Kit | Dodge Challenger RT/SRT8 (11) (T1R-D04)2011 Dodge Challenger RT SRT8 Twin Disc HD Race Kit by ACT T1R D04 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 performed on all diaphragms. The ACT twin