A belt-driven turbocharger is called a supercharger. Turbos use exhaust gasses, superchargers use belts, chains or some other kind of direct drive for the compressor. -- Mike > I believe there are belt-drive turbochargers as well > as exhaust drive. Intercooler is key to performance, > as heat generated in compression robs the power > benefit of the compressed air. > > Am I wrong there? > > Pete >