16. Chevrolet Corvette C3 (1980)
Between 1970 and 1980, the Chevrolet Corvette was the same car with 10 years between them. The design was the same, although 1980 had a more sculpted front and rear end and less chrome. The technology was the same, and the engines were the same on the outside. But in 1970, the hottest Corvette had 435 HP. In 1980, the hottest Corvette had a modest 180 HP (via Corvette Museum).
So what happened in just 10 years, and where did all those horses go? The recession, emission standards, and safety regulations appeared and killed almost all performances from the legendary Corvette. The 1980 Corvette was kind of a dinosaur with old technology under its plastic skin, lazy engines, and an outdated interior.