[TRE Cup]

These were the performance bomb to have back then. A friend could not afford the X, so he bought the GN, then with herb adams suspension and a couple other tweaks, bigger rims and tires, it handled surprisingly well.
I threw a set of yoko R tires on it and took it to a Ferrari Owners Club laguna seca event to play amongst the stallions. The transmission ratios sucked huge (big drop between gears), but with some good ol fashioned taxi wrangling that brick went like the wind around that track. There were not many red cars that could keep up with it !
Still you could feel how light the chassis/body was and we would see plenty of talk of how the back of the body would wrinkle without the right chassis bracing at the drags.
GM did some cool performance stuff here and there during those years. Callaway had a factory option code for a turbo vette right off the show room floor.

Syclone: Jay Leno was given one with a larger turbo, different rear end ratios, and some programming. Just left me in the dust chasing him thru the Sepulveda basin one night. Dang fast boxes !