In 1991 Pontiac Firebird received restyled front ends look like Banshee show car . Pontiac had developed the fourth generation Firebird. 1991 Pontiac Firebird Trans Am's ground effects restyled as well. 1991 Pontiac Firebird base model available with 1991 Pontiac Firebird Trans Am ground effects. Trans Am and 1991 Firebird Formula receive new fiberglass constructed flat wrap-around wing spoilers. The new styling brought higher sales, up from 1990's sales. All L98 cars now receive N10 dual cats standard. Trans Am and '91 Firebird GTA get updated 2 piece taillights with "PONTIAC" scripted in orange across the panels. Center high mounted stop lamps move to inside top edge of hatch. '91Firebird convertible reintroduced. Firebirds with tops were sent to ASC for conversion to convertibles. Previously ASC converted cars for customers but it had never been through GM. The 91 Firebird convertible was available with the LHO 3.1L V6, the L03 5.0 V8, and the LB9 5.0 V8. Production improvements led to use of new body sealants that added to the rigidity of the body.
1991 Firebird
| Year | Model | Trans | Engine code/type |
CR | Displ. | HP | Torque | Induc- tion |
Manual std. |
Manual opt. (G92) |
Auto std. |
Auto opt. (G92) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991 | RS Firebird |
M5,A4 | LH0 V6 | 8.5:1 | 3.1 (191) | 140@4400 | 185@3600 | MFI | 3.42 | ---- | 3.23 | ---- |
| 1991 | RS Firebird Formula |
M5,A4 | LO3 V8 | 9.3:1 | 5.0 (305) | 170@4000 | 255@2400 | TBI | 3.08 | ---- | 2.73 | ---- |
| 1991 | Z28 Formula Trans Am GTA |
M5,A4 | LB9 V8 | 9.3:1 | 5.0 (305) | 205@4200 | 285@3200 | TPI | 3.08 | ---- | 2.73 | ---- |
| 1991 | Z28 Formula Trans Am GTA |
M5 | LB9 V8 | 9.3:1 | 5.0 (305) | 230@4200 | 300@3200 | TPI | ---- | 3.42 | ---- | ---- |
| 1991 | Z28 Formula Trans Am GTA |
A4 | L98 V8 | 9.7:1 | 5.7 (350) | 245@4400 | 345@3200 | TPI | ---- | ---- | ---- | 3.23 |
| Year | Total Production |
Firebird | Firebird Convertible |
Formula | Formula 1LE | Trans Am | Trans Am 1LE | Trans Am Convertible |
GTA | Firehawk |
|---|---|---|---|---|---|---|---|---|---|---|
| 1991 | 51,184 | 37,162 | 950 | 5,490 | 46 | 3,452 | 6 | 555 | 2,915 | 8 |