1973 911 Turbo
Porsche is a company synonymous with turbocharged engines. The 911 Turbo had a completely different look than any other car at the time, and it had a popular run in the International Race of Champions (IROC). The interesting thing about the 911 Turbo was that it utilized a revolutionary engine. The compact design of the car had a quintessential Porsche style that defined the brand for decades (via Classic Driver).
The 1973 911 was a notable one that redefined the turbocharged era for the rest of the decade. With the excellent performance the 1973 911 Turbo had the performance you could only dream of at the time, although it combined that with traditional Porsche character. The excellent car had the kind of design and engineering that redefined the sports car era in the 1970s and helped separate it from the muscle cars of the time.