We have a V6SE AWD with the factory 4 speaker CD6 system. The stock sound is pretty bad. Boomy floppy sounding bass, decent highs and recessed mids. The head unit is rated for decent power so I decided to replace the speakers first. Since I was very impressed with the JBL Power series speakers I put in our Subaru wagon I decided to go with speakers from that line. I ended up with these: p8652 6x8 coaxials in the rear doors and P550C 5.25 components with adaptors in the front doors. The total cost would have been around $450 from an authorized dealer but I got them both for around $250 shipped on Ebay. Yes I don't get a factory warranty but I have never had a car audio speaker that I put in fail and at that price I can replace them if they do. The sound is so much better that there is literally no comparison. It now sounds like a true high fidelity system. It would probably sound even a bit better with an amp and head unit but it sounds good enough now and no further upgrading is really necessary. It probably would have only cost Ford $150 to put speakers like this in the car. I often wonder why most stock audio systems have such junk speakers in them. I guess so many people shop for cars buy squeezing the dealer for every dollar that an additional $150 on the sticker would lose them a bunch of sales.