Neither pick up a book on building speakers and build proper enclosures for the stock speakers, replacing open air drivers with more improperly enclosed drivers is a waste of money and a bit embarrassing imo.
Notice everyone raves at TNA sound. One of the first things I noticed during one of Jack's very early streams of TNA in Whitewood was the actual speaker enclosure. I.knew right then and there Scott knew WTF he was doing.
Even a very inexpensive driver can sound amazing if things are designed correctly.