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)
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