You need to be careful about removing your VIN tag and re-installing it. At least don't post details on an open forum until you understand what the potential implications are. A quick Google search should give you details on federal and state law. I mess with early Broncos and know the ins and outs of these with respect to the VIN (official VIN is on the frame; glovebox door has the warranty tag), but pretty sure Mustangs are different.