an option combination, not a separate package or model that dealers were aware of the existence of, resulting in 111 cars built with 1LE equipment in 1989. 1990 The 1990 model year finished the lowest production to date (35,048), due to a truncated 1990 model run followed by the early introduction of the facelifted 1991 models. 1990 also marked the final year for the IROC-Z; Chevrolet had decided not to renew its contract with the International Race of Champions. This year was the first year for an airbag to be offered in any F-body. The new airbag came along with a new "half-moon" gauge cluster, that was offered only in 1990–1992 Camaros. The sharp edges on the dash surfaces were rounded and the lettering on gauges switched to yellow from white. 1990 was a distinguishable model year as it was the only third-generation Camaro that did not feature the updated ground effects of the 1991–1992 models but did have the newer interior/dash features. The 2.8 L V6 was upgraded to the 3.1 L V6. The RPO code 1LE was again available in 1990, triggered as in the previous year by RPO G92 Performance Axle combined with no air conditioning on the IROC-Z coupe. Only 62 Camaros were built with 1LE equipment in 1990. The Last 1990 Camaro Rolled off the line on December 31, 1989. Camaros in IROC-Z trim that were equipped with the 5.7 TPI Motor received a slight horsepower increase to 245 at 4,400 rpm and torque numbers also rose to 345 at 3,200 rpm. 1991 Production for the 1991 Camaro started in February 1990. Big changes occurred, as all Camaros received a facelift in the form of a ground effects package for not only RS but also the Z28 models, while the IROC-Z was no longer offered. The Z28 also featured a high rise spoiler and non-functional hood "blisters". The CHMSL was relocated from the spoiler to the top of the Hatch again like the 1986 models, except the housing was now on the inside rather than the outside of the hatch. The Convertible still retained the spoiler mounted 3rd brake light. The 1991 Z28 also received a new wheel design to accent the new body. The B4C "Special Service" option was made available to law enforcement, the government, and military agencies. The B4C amounted to little more than a Z28 powertrain and suspension in the RS.