Super Chip (ADS) part number 8602A for 1986 GM, 305 , 4 barrel carb , manual trans car. The chip is new old stock. It is still in the box in the original shrink wrap liner. This chip replaces the stock computer chip and reprograms the engine for improved performance. ADS Super Chip improves performance without sacrificing drivebility or economy. I sold my IROC and had not installed the chip before I sold the car.