- The new 1991 Firebirds were actually introduced in the spring of 1990.
- Their most visible change was a new exterior appearance.
- All models benefited from restyled front and rear fascias.
- The front fascias, made of body color resilient "Endura" thermoplastic, incorporated low-profile turn signals and integral air dams.
- At the rear, the GTA, Trans Am, and Formula were fitted with a redesigned rear deck lid spoiler.
- New fascias on GTA and Trans Am models incorporated restyled taillights.
- The Sport Appearance package on the base Firebird included fog lights in the fascia and carried the aero look to the sides with distinctive lateral skirting.
- The headlights were more compact, without sacrificing light output.
- Available in 1991 for all 5.0-liter and 5.7-liter TPI V-8s was a new "Street Legal Performance" (SLP) package of GM high-performance hardware.
- The SLP kit, available from GM dealers, boosted engine performance without modifications to the power plants.
The kit could be dealer-installed or owner-installed.
- All 1991 Firebirds were protected by a Pass-Key theft deterrent system.
- All Firebirds had a driver's side airbag.
- The standard radio was upgraded to an AM/FM cassette stereo and the GTA included a cassette with five-band graphic equalizer.
- Acoustics were improved in all models.
- New colors included Dark Green Metallic and a Bright White.
- Standard Firebird equipment included
- a 3.1-liter MFI V-6
- a four-speed automatic transmission
- the FE1 suspension
- P215/65R15 tires
- 15 x 7-in. Hi-Tech aluminum wheels
- disc/drum brakes
- new front/rear fascias
- and an AM/FM stereo with cassette and clock
- The Formula added or substituted
- a 5.0-liter TBI V-8
- a five-speed manual gearbox
- the WS6 Sport Suspension
- P245/50ZR16 tires
- 16 x 8-in. Hi-Tech Turbo aluminum wheels
- a limited-slip differential
- air conditioning
- The Trans Am added or substituted
- a 5.0-liter TRI V-8
- the F41 Rally Tuned suspension
- 16 x 8-in. diamond spoke wheels
- an aero package with special side treatment
- a leather appointment group (including leather-wrapped steering wheel)
- a four-way manual driver's seat adjuster
- Standard equipment for the Trans Am GTA included
- the 5.7-liter TPI V-8
- a four-speed automatic transmission
- the WS6 Sport suspension
- P245/50ZR16 tires
- 16 x 8-in. diamond spoke wheels
- a limited-slip differential
- disc/drum brakes
- a Performance Enhancement group (with engine oil cooler, dual converters and performance axle)
- new front/rear fascias
- an aero package with side treatment
- air conditioning
- an upgraded sound system
- a power antenna
- the leather appointment group
- a four-way manual driver's seat
- power windows
- power door locks
- cruise control
- a remote deck lid release
- power outside mirrors
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