one of my co workers drives a 03 mustang gt with an optional mach III(?) sound system in it. when i pop the trunk, i saw 4 little amps and 2 10's that had "MACH" printed onto the cone that sit flush on both sides of the wheel wells. it was at night so i didnt get a good look. but i was curious if anyone here knows more about this factory setup? it sounded really good for a factory made stereo system.