My CD player works for a small period of time and then stops working for a while. I have cleaned it, tried different CD's and so forth, but it won't work. What can I do to fix it. I have the Radio 50 without NAV with the tape player. Can I add a cd changer factory to just replace what the single was doing?

Also how can I connect my iPhone to my audio system, being as there is no AUX input or iPod adapter?

Also my rear center SUB I guess needs to be replaced? Any suggestions would be helpful. Should I replace it stock or aftermarket? Which brand if aftermarket.

THANKS