KingTec Racing's custom High Performance Forged Stroker Kits consist of 4340 forged crankshaft, 4340 forged connecting rods and 4032 Aluminum forged piston set along with gudgeon pins and ring sets. They are designed for all motorsport classifications including drag racing, and circuit racing. They are widely for performance engine tuning include Toyota, Honda, Nissan, BMW, Volkswagen/Audi, Subaru, Mitsubishi, Ford, Mazda and Mercedes-Benz/AMG, etc.