Not exactly sure. Checkered Flag put it in. All of my service has been second to none so I take their word on any installation they do and I don't ask questions. It was installed in March. Jason my service-rep said it was the first time they saw a fuel pump go bad on an e46 323i. Thats why I had to have it serviced like 3 times over 2 weeks. They gave me a bunch of stuff done to the car for free because they thought my problem was fixed a few months prior.