[6] The mid-range model, the Sigma GL, came standard with the 1.85-litre Astron and four-speed manual,[5] providing 60 kW (80 hp) and 145 N⋅m (107 lb⋅ft).

[7] This included exterior striping, quartz-halogen high-beam headlights, a sports steering wheel, low-fuel warning light, tachometer and steel belted radial tyres.

[10] In March 1978, a Japanese-made, two-door coupé version called the "Sigma Scorpion" was released—based on the Mitsubishi Galant Lambda.

[4] Although the Sigma Scorpion shared many common engine and mechanical components with the sedan, all body panels and most interior features were unique to the coupe.

[11] On 1 November 1979, Chrysler announced and commenced sales of the enlarged, 2.6-litre Astron engined Sigma GL and SE.

Mitsubishi released a limited edition, GL-based Sigma Satellite in c. April 1981, adding two-tone paint (available in three combinations), unique hubcaps, a soft grip sports steering wheel, cloth upholstery, full tinted glass including laminated windscreen.

The redesigned GJ Sigma was released in March 1982, based on the 1980 Japanese domestic market Mitsubishi Galant.

[24] Priced $1,000 below the GL luxury level, the Satellite was built in sedan and wagon versions, with air conditioning, five-speed manual or automatic transmission all as options.

[27] Produced as a limited edition of 500 cars and placed above the SE trim level from which it derives, it came only with the 2.6-litre in either five-speed manual or three-speed automatic.

[26][27] Other equipment fitted to the Super Saloon included air conditioning, alloy wheels, and four-wheel disc brakes.

Chrome detailing (around gauges and air vents, which often had a tendency to peel off) was replaced by black painting, and the door trim was now two-tone in certain models.

A few other slight changes were included in the GK Sigma, for example, the boot was fully lined with carpet and also featured a plastic protector for the lights.

As for the mechanics of the car, the GK was unchanged from the GJ, while the SE model featured rear disc brakes as standard.

The GSR received a sportier front air dam, rear spoiler and 15-inch alloy wheels and was only available with the 2.6-litre engine and five-speed manual transmission.

In July 1984, Mitsubishi reintroduced the Super Saloon trim level, again based on the Sigma SE sedan and incorporating luxury items normally offered as options.

[29] The GK Super Saloon generally followed the GJ's structure, although changes included new corduroy trim and stereo system with Compact Cassette facility, AM/FM scan tuning, and digital display.

[29] Mitsubishi also introduced a limited edition GK Sigma Satellite in late 1984, based on the XL but with the 2.6-litre engine and five-speed manual (or automatic optional), side stripes with Satellite badge identification, cloth-trimmed upholstery, AM/FM/MPX radio with dual speakers, distinguished wheel trim, additional silencing, tinted windscreen, and heated rear window.

[30] Released in July 1985, the GN was an update, but also a rationalization of the previous Sigma range due to only being offered in GL trim.

Mitsubishi launched GL Satellite limited editions of the GN series in c. October 1986, adding air conditioning, unique striping, headlamp protectors, front and rear mudflaps, tilt adjustable steering column, remote control tailgate (for wagons) and side mirrors.

Although they were of a previous generation to the front-wheel drive Mitsubishi Sigma sedan (which was similar, but of a narrower bodyshell to the Magna, and fitted with smaller engines) range being sold in New Zealand, they proved popular, particularly with fleets.