Genuine Porsche rubber Air Oil Seperator Bellows. Used on 1997-2004.5 Boxster and Boxster S, and 1999-2001 Carrera and Carrera 4. We have seen these tear and cause issues before. If you have an oil leak on the right hand side of your Boxster, or left hand side of your Carrera, see if you can check this part out. Ships fact from our NC location.