 "Car and Driver" picked the 1984 Camaro Z28 as the best handling car built in the United States.For 1985, Chevrolet introduced the IROC-Z version that was named after the International Race of Champions.Offered as an option package on the Z28, the Camaro IROC-Z featured an upgraded suspension, lowered ride height, specially valved Delco-Bilstein shocks, larger diameter sway bars, a steering/frame brace known as the "wonder bar", a special decal package, and an optional Tuned Port Injection system taken from the Chevrolet Corvette.