as a certified installer, though out of the business for a few years, I can tell you that replacing just the speakers isnt going to improve your sound quality. Most newer cars use a basic paper or a cheap polypropylene speaker cone with foam surrounds, but that is actually what Bose uses in some of their best home speaker systems too. The difference is the level of wattage and clean wiring/signal that gets to the speakers themselves. Most of todays factory units are making little more than 8 watts per channel continuously and almost none of the basic systems like the ones in the Forte will exceed 20-40 watts per channel MAX..... Almost ANY aftermarket speaker can "handle" that, but it will still sound similarly tinny and lacking bass.