4. 1977 Pontiac Trans Am
The 1977 Pontiac Trans Am remains an American icon, but emissions regulations heavily restricted its factory output. Performance enthusiasts quickly realized that upgrading the exhaust system and enhancing ignition components could restore the muscle car’s true spirit. These modifications brought the Trans Am back to life, giving it the power and street presence it deserved. The result was a classic muscle car that could confidently outperform many of its rivals. Read more about its history at Car and Driver.