Chevrolet's model hierarchy centers on RS and IROC-Z; the visible standalone Z28 branding remains absent. The performance order material includes the track-oriented equipment combinations from which 1LE cars were built, although package-volume claims require a separate production record.
The IROC-Z is the sole visible top performance identity, while 1LE illustrates how a competition-oriented car can be defined by an option combination rather than a prominent badge.