Suspension Components (front): modified MacPherson struts, lower A-arms, coil springs, tube shocks, and anti-roll bar
Suspension Components (rear): Live axle, with trailing arms, torque arms, and Panhard arm, coil springs, tube shocks, and anti-roll bar
Suspension Components (rear): Live axle, with trailing arms, torque arms, and Panhard arm, coil springs, tube shocks, and anti-roll bar
For 1991 and 1992, GM offered the SLP Engineering “Street Legal Performance” performance kits through GM dealers. These kits were offered either as a dealer-installed option or could be installed by the customer. Each kit consisted of the following:
1)SLP Hi-Flow Aluminum Siamesed Intake Runners,
2)SLP Tri-Y Stainless Tuned Exhaust Headers,
3)SLP Low-Restriction Stainless Exhaust System, and
4)Revised Engine Cal-Pac PROM (specific to application).
These kits were the first GM-authorized totally integrated performance upgrade packages for TPI-equipped cars which substantially improved performance without sacrificing fuel economy, drivability, and emissions legality. These kits were warrantied through GM by SLP Engineering.
Engine power increased by 50 HP at 5500 RPM, long above the point where the stock LB9 and B2L stopped performing, and there were corresponding torque increases from 2800 up through 5500 RPM. Each part was also available separately through GM dealers. There was also an available SLP Cold Air Induction Package that was not part of the complete kit, but sold separately.
The kits were offered specifically tailored to the engine the car was equipped with and other variables. The part numbers were as follows (these numbers are the ones relating to GTA models; kits were also available for other Firebird models as well):
1987-1988:
GM # 12341390 : 305 TPI with 3.08 ratio – Single Exhaust (S.E.) $1,930
GM # 12341392 : 350 TPI with 3.27 ratio – S.E. — $1,930
