ACT Twin Disc MaXX XT Street Clutch Kit | Dodge Challenger RT/SRT8 (11) (T3S-D04)2011 Dodge Challenger RT SRT8 Twin Disc MaXX XT Street Kit by ACT Heavy to very heavy pedal effort, smooth engagement, mild to moderate gear rattle; Disc surfaces doubled for better wear, heat capacity and longer life, further extended by ACT's exclusive diaphragm design; Carefully engineered, precisely assembled, accurately balanced, with premium organic friction materials for heat tolerance and reduced fade; Recommended for race use only; 100% clamp