Originally the Leopard was available with naturally aspirated inline four- and six-cylinder engines of 1,800, 2,000, and 2,800 cc displacement; the largest engine received an electronic engine management system developed together with Hitachi, and was called NAPS-Z. The 1.8 liter fours were also originally available with a four-speed manual transmission, all others received five-speeds as standard (or an optional three-speed automatic). In July 1981 a two-liter turbocharged engine was added. Available as a GX, SGX, and ZGX, it had the same maximum output (145 PS) as did the more expensive and heavier 2.8.