Ferarri F40, this is the car which defines the ferrari name. Released at a time where many manufacturers produced cars of engineering brilliance (R32 GTR, E30 M3...just to name a few). In recent times technology has stumped the development of car engineering (reduced overall drivability, excess weight and handling...). I don't think we will see a car which overwhelms us in regards to engineering for the next 20-30 years. Bring me back to the 90s.