6. 1979 Pontiac Trans Am
Unfortunately, the days of big cube engines and high horsepower ratings were gone in 1979, so Pontiac decided to invest in new technology to generate power. That new technology was turbocharging, and in late 1979 it introduced the Trans Am Turbo (via Hagerty).

The engine in question was a 301 V8 with a Garrett turbocharger bolted onto it. The power output was relatively modest at 200 to 210 HP, but the torque was high at 340 lb.-ft, which resulted in a hint of performance. Highly-preserved examples can fetch over $50,000 at auctions.