11. 1973 Pontiac Firebird Formula SD-455
The 1973 Pontiac Firebird Formula SD-455 emerged as a phoenix during an era overshadowed by emissions restrictions. With its rare Super Duty 455-cubic-inch V8, this Firebird delivered a level of performance few thought possible in the early ‘70s.
Its robust power and limited production numbers have made the SD-455 a coveted prize among collectors. Even against tightening regulations, Pontiac proved that American muscle could still roar with authority and style.