Well if its got a preout for sub, then there is no reason why not, but the amps built into headunits are not bery powerful at all. 18W rms, compared to like 350 or 500 for what a monoblock amp would give. so bass and the sound quality of the bass will be pretty bad.
defo worth getting an amp though, quite cheap of ebay, easy to wire in to and you get much better sound quality, especially if you amp the speakers as well.