 Realising its commercial potential, Callaway told Sherman that he could make turbocharger kits available to the BMW community despite not having the necessary equipment to manufacture the components including a drill press.As business began to arrive, Callaway formed Callaway Cars, Inc in 1977.Over the years, Callaway developed turbocharger kits for BMW, Volkswagen, Porsche, Audi and Mercedes-Benz.