one basic configuration, which combined the GSR's close-ratio transmission, a live axle rear suspension and a larger engine. Rear disc brakes and alloy wheels were available together as a package. Other US options were minimal; air conditioning, cassette player, automatic transmission, cruise control, power door locks, power mirrors, power windows, and a moonroof. The American, Australian, and Japanese-market 2.6 L Astron engine helped introduce Mitsubishi's then-new Silent Shaft balance shaft engine technology, which minimized the inherent vibration of a large four-cylinder in-line engine. Japanese buyers were liable for more annual road tax for selecting the 2.6 L engine over the smaller engines. The US version also featured a "Jet Valve", a small secondary intake valve which improved emissions by enhancing swirl in the combustion chamber, allowing for burning of a leaner mixture. A similar engine without the Jet Valve was available in Mitsubishi-built trucks and in the Canadian versions of the Sapporo/Challenger. It also found its way into a large number of Chrysler's K-cars and their derivatives. Beginning in 1980, Japanese versions of this car were available with electronic fuel injection, or a new 2.3 L Astron turbodiesel engine. For the 1980 model year (the second generation), the suspension was revised, with improved geometry in front and an all new four-link rear suspension. The turbo models were introduced, of which some came with independent rear suspension (as later applied to the Starion). The second generation also brought variable-assist power steering, which provided greater assistance at low speeds and less at higher speeds. It was also slightly larger, with increased footroom, headroom, and luggage space. The Galant Lambda GSR was a predecessor to the more overtly sporting Mitsubishi Starion, which was based on the same chassis and drivetrain. The Starion continued the rear-wheel-drive Galants' model codes, being called the A180, while the new front-wheel-drive Galants started afresh from E10. North America The car was marketed in North America as a captive import of the Dodge and Plymouth divisions of Chrysler; the cars differed only in minor details such as taillights, interior trim and available colours. Despite being mechanically identical, the Dodge Colt Challenger was positioned to appeal to the performance market while the Plymouth Sapporo was targeted at the luxury market. To mark its sportier nature, the earliest Dodge Colt Challengers were only available in a two-tone silver/charcoal paint. For 1979 four more color combinations became available. Equipment was very complete