My friend just bought a Mach 1 that has had a complete audio upgrade, subs, amps, head unit everything. Everything is alpine and its a really nice system. He wants to get back to stock and that's where my mustang comes in.I have the complete stock Mach 460 system. Here's my question will everything be able to be switched over? How hard will it be to do? Also is the radio harness In my mustang the same for a Mach 1.