Chevy loses IROC sponsorship to Dodge, and right to use IROC name. Z28 nomenclature returns on top-level Camaro. Order your RS with the 5.0-liter V8 engine, and you can opt for a 16-inch wheel and tire combination. Z28 models have a revised hood, scooped rocker panels, and a more aggressive rear spoiler. Color-keyed alloys are available.