96 and 97 (right, because the S2 started in non-w bodies in 96 ) has a black vacuum tree in the charger about 2-3 inches from the throttle body end on the front side of the motor. This was used for the boost control and fuel pressure regulator. A 96 charger will have a painted body, 97 and later, only had painted snouts. In subsequent years 98+ the tree was eliminated and the vacuum went around the charger in a horseshoe fashion. Both chargers are otherwise the same.