13. 1973 Pontiac Firebird Trans Am SD-455
The 1973 Pontiac Firebird Trans Am SD-455 is revered for its mighty Super Duty 455 engine, one of the most formidable V8s of its time. Limited production numbers have made surviving examples especially desirable.
Auction prices for SD-455s have climbed steadily, reflecting their status as a top-tier collectible. For more details on production stats and recent sales, visit popular Firebird enthusiast sites.