Initially, there were three Colt Galant GTO (A53C) models offered, all powered by the Saturn engine: the M1 (1600 cc SOHC, 4-speed single carb), the M2 (1600 cc SOHC, 4-speed, using twin Mikuni-built Solex carburetors for a total of 110 hp)(SAE).and the top-spec MR (1600 cc twin-carb, DOHC five-speed), a 125 horsepower version only available in Japan.