Spec Super Twin disc P-Trim Clutch kit 11-17 Mustang 5.0L SPEC Clutch SF50SST-2 - SPEC Super Twin Clutch Kit SS-Trim: Ford Mustang 2011-2017 5.0L. The SPEC Super Twin is for street and track use in cars with extreme horsepower and torque (700-1500 ft lbs... MSRP: Was: Now: $1,439.00