From the article:
If you’re familiar with Chevy Camaro history, then you’ll know that one of the most famous models was the IROC-Z, launched in 1985. The IROC-Z was an options package that took its name from the International Race Of Champions. Essentially it was an upgraded Z28 that had an improved suspension, larger sway bars, lowered ride height, Delco-Bilstein shocks, and unique decals. Now that modern muscle cars have found a new generation of fans, it wouldn’t be an unreasonable assumption to see older ones increase in value.

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that was the best 3 gens made yes no doubt