This is a discussion on Mach 1 Stock Exhaust within the 4.6 Talk forums, part of the 4.6L Mustang category; Does anyone know if the 03-04 Mach 1 came with a X or H mid-pipe stock?...
I have a non-stamped X-Pipe on my car that was installed before I bought it. It has a healthy layer of surface rust and I couldn't tell if it was stock or just a cheap after market mid-pipe.