TCI Pro-X Drag Race Torque Converters are built exclusively for use in Top Sportsman, Top Dragster, and 10.5 Tire Outlaw classes with multi-stage, nitrous-assisted, supercharged, and twin turbocharged engines. Made for most GM, Ford, and Chrysler transmissions with either six-bolt or four-bolt mounting flanges. Metallic gray HDT coating enables PRO-X Torque Converters to operate at reduced temperatures with faster cool down time.