10. Pontiac Bonneville Brougham (Late 1970s)
The late 1970s Pontiac Bonneville Brougham featured a commanding full-size, rear-wheel-drive platform perfect for a muscle-grade V8 powerhouse. However, following the oil crisis, GM focused on downsizing and complying with stricter emissions regulations, drastically reducing available performance. As a result, the Bonneville Brougham’s power output was tamed, and its muscle car dreams went unfulfilled. For more on this elegant cruiser’s missed opportunities, check out Old Cars Weekly.