There were only 547 GNX's made in 87. The total GN's made from the 2 years that matter(86'-87') were 25,706. I own 1 of the late 87' GN's made in November of 87'. Had it dynoed a few years back, it was totaly stock including plugs,wires,exhaust,air filter etc. Miles were only at 29,000. The results were very impressive 240whp and 375lbft of torque at 2000rpm. Stock 1/4 times were 14.10's@105, 0-60 in 5.5. Just replacing the rims and tires(weld lites and Drag radials) the times dropped to 12.8 in the 1/4 and 4.3 0-60. The GN responds well to just bolt ons.