What is your favorite forgotten automotive performance package?

When people hear things like Cobra, Z28 and R/T they automatically think performance, or at least an attempt at performance. This weekend we want to know about the interesting less recognizable performance options, now forgotten by all but those truly obsessed with cars. What is your favorite forgotten performance package?

In my quest to own every muscle car GM built in the late 80s I'm short one ultra expensive black Buick and the 1989 Pontiac Turbo Trans Am, my answer to this QOTW. Only sold for one year in very limited numbers, the 20th Anniversary TTA had a version of the GNX's Turbo 6 heart stuffed in a much lighter and much whiter body. It was hard to pick out the 1555 TTAs built in 1989 from any other white Trans Am, at least until you got to a stop light. Car and Driver recorded a 4.6 second 0-60 time from a brand new TTA.

What is your favorite forgotten automotive performance package?