Mosselman Turbo Systems’ “300CR Silver Arrow Bi-Turbo” conversion pairs twin Garrett T25 turbochargers with a dogleg five-speed manual transmission, 500E bodywork, widened rear arches, and a carbon-fiber aero package. The engine was overhauled in October 2020 with a rebuilt cylinder head, replacement head gasket, rod bearings, valves, guides, seals, piston rings, fuel injectors, valve cover gasket, and ignition components.