Buick GNX
In 1982, Buick started experimenting with turbocharging its standard V6 engines. The results were satisfying, and engineers got permission to develop a performance version that would deliver better acceleration figures (via Car and Driver).
The first model was the Buick Regal T, and then the Buick Grand National with 175 hp, which wasn’t impressive, but it was a start. In the next couple of years, the Grand National got a bigger engine and more power, jumping from 175 hp to 200 hp and finally to 235 hp. However 1987, the ultimate version of GNX (Grand National Experimental) was released. It featured the same 3.8-liter turbocharged V6 with 275 hp and 0 to 60 mph of 4.7 seconds.