It included features such as cloth seating surfaces, 14" tires and steel wheels with plastic wheel covers, manual windows and door locks, an AM/FM stereo radio with a four-speaker audio system, a heater (no standard air conditioning), a 2.2L dual overhead cam (DOHC) inline four-cylinder (I4) gasoline engine, and a five-speed manual transmission.

It included features such as upgraded 15" tires and steel wheels and plastic wheel covers, air conditioning, and an AM/FM stereo with a single-disc CD player (which also included an auxiliary audio input jack in later model years).

It added more convenience items such as power windows and door locks, keyless entry, 16" tires and aluminum-alloy wheels, upgraded cloth seating surfaces, and an AM/FM stereo with both cassette and single-disc CD players (later, an AM/FM stereo with satellite option, a single-disc CD/MP3 player, and an auxiliary audio input jack).

The 2003 Saturn Ion quad coupe production car first appeared at the 2002 New York International Auto Show.

The transmission lacked an overdrive, allowing for five forward gears to be packaged in the size of a typical four-speed manual gearbox, both providing close gear ratios for better acceleration and fuel efficiency while eliminating the heat and parasitic loss generated by the additional planetary gearset.

For 2004, Saturn also re-calibrated the electric power steering, as well as upgraded interior materials, and offered new sound systems.

An "Appearance Package" was offered for the 2007 Ion 3 Quad Coupe, including redesigned front and rear bumpers, side moldings, elliptical fog lamps, and a chrome exhaust tip.

Included in the Competition Package were 17" Gunmetal Painted Alloy Rims, Ladder Tachometer w/ shift lights, a Limited Slip Differential, and Optional Projector-beam Fog Lamps.

[12] In mid-2006, GM released two Engine Kit upgrades for both the Ion Red Line and the Cobalt SS.

[13] On October 17, 2003 at the Bonneville Salt Flats in Utah, the Saturn Ion Red Line, piloted by the GM Performance Division's "Saturn Land Speed Record Project" set a new land-speed record in the "G/Blown Fuel Altered" Class at 212.684 mph.

The Ion was the last Saturn to have brand-specific design cues originating with the S-Series such as plastic body panels.

In February 2014, the Ion was added to a list of General Motors cars recalled due to a faulty ignition switch.

13 deaths were found to have been caused by the defect in Chevrolet Cobalt models, prompting the recall of the Ion and other related GM vehicles.