They don't put out enough to power a sub, that's for sure. I had a bandpass box installed in my 03 GT and my Mach 460 had to be wired to my subwoofers amp. They took my two factory amps out. My were located in the front of the trunk under the rear glass and behind the seats. The 2 amps have a weird wiring harness that can't be wired to anything else. If I were you I would just buy a new stereo reciever, a powerful amp, and a pair of 12's and get rid of the Mach. I couldn't even wire my new system into my 6 disc stereo because I never had the harness necessary. They're good stereos, but Ford obviously doesn't want them tampered with .