12. 1989 Pontiac Trans Am 20th Anniversary
In 1989, Pontiac celebrated the 20th anniversary of its favorite muscle car, the Trans Am. So, what was a better way than to introduce a limited run of 1,500 cars to commemorate the occasion? But, the anniversary editions needed a twist and not just another decal and paint job. So, Pontiac decided to install the Buick 3.8-liter turbo V6 from the GNX to create the fastest Trans Am of the decade.
The white commemorative edition could accelerate 0.1 seconds faster from 0 to 60 mph than the GNX at 4.6 seconds. The reason was that the Trans Am 20th Anniversary had better weight distribution and gearing from the Pontiac gearbox.