if you find a radio frequency which is suitable then you have no problem, i've used the akai FMT-93BT and it was very good
if ur car has a tape deck, better off with a 3.5mm to tapedeck
but honestly dude, u may as well learn how to replace the head unit.
the sound quality isn't very good but that depends on how much of a hi-fi guy you are. fine for just some tunes while driving