HYPERFORMANCE specializes in the rebuilding of stock and high-performance engines, CNC-ported heads, and the manufacturing of billet ductile iron and aluminum cylinders for all years and make American V-twins. The Monster Motor Division builds custom race and street engines like 205" Street PROmotor. Hyperformance's product line also includes Hyperpacs, R&R Cylinder Heads, Big Jug Cylinder Kits, and numerous other engine and transmission parts.