- 2.5L normally aspirated: 2000 and later:
- 2004 and earlier: to connect the throttle body to the original air filter box
- 2005 and later: Forester and Impreza: to connect the throttle body to the air flow sensor.
- Elbow Hose to throttle body
- Elbow Hose to coupler or to air flow sensor
- Coupler Hose to air filter for 2000 and later Subaru engines
- Hose Clamps