This is a fuel filler pipe, also known as a fuel filler neck for your 1999-2004 Mustang. This pipe is located behind your fuel/gas door and runs directly into your fuel tank. Over time these filler necks can rust or get damaged and need to be replaced to ensure safe operation of your Mustang.
Ford Motor Company Genuine Parts, Motorcraft® Parts and Ford and Motorcraft Remanufactured Parts are all excellent choices when it comes to performance, longevity and value for your Mustang or SVT Lightning. And they’re all backed by a Ford Motor Company limited parts warranty*, so you know their parts you use are going to perform like they should. Put the same parts on your Lighting & Mustang that came from the factory!