Yes of course it can be done however
i'm not sure if the stock unit has rca outputs, but you can buy a lineout converter which takes the speaker level connections and lets you connect them to an amplifier through rca cables.
Alternatively, you can get an amplifier that accepts speaker level inputs.
08 V6 Mustang
JLT CAI, 93 OCT race tune, pypes x-pipe w/ gt take offs, 8.8" w/ 3.73, shaftmasters 3.5" aluminum driveshaft, gt front/rear swaybars.