Vintage Air has upgraded its Gen IV SureFit air conditioning systems for 1967-1968 Firebirds and Camaros. The revisions include new refrigerant and heater-hose routing through the fenderwell, condenser mounts with an integral drier bracket, and simplified conversion of the controls. The new controller eliminates the factory three-speed fan switch in favor of a cable converter potentiometer, which allows infinite blower fan speed adjustment. Two versions of the system are available: complete conversion kits and evaporator kits for cars that don’t require new underhood components. Information: Vintage Air, 800/862-6658, vintageair.com.