This secondary air injection check valve is designed to match the fit and function of the original valve on specified vehicles, and is engineered for durability and reliable performance. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [BMW 325Ci: 2003, 2004, 2005, 2006] - [BMW 325i: 2003, 2004, 2005] - [BMW 325xi: 2003, 2004, 2005, 2006] - [BMW 330Ci: 2003, 2004, 2005, 2006] - [BMW 330i: 2003, 2004, 2005, 2006] - [BMW 330xi: 2003, 2004, 2005, 2006] - [BMW X3: 2004, 2005, 2006]