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If you send CD music to your factory radio, it will sound just like all the other music you hear through it. Maybe a little clearer, but not any louder.
You can add better speakers to your system, that will give you a decent upgrade to your sound, but unless you go to an amp system. you won't be splitting your ear drums out.
Go Here --> http://www.crutchfield.com/ and call them, tell them what you are wanting to do, and they should be able to help you.....
I added a CD changer in the back storage compartment, and upgrading the speakers in the stock locations. The CD sounds much better than the orgianl FM set up, though not as robust as a modern stereo set up. I used a 6 CD Pioneer, which will fit angled mounted, and the cover will close. Being my car is a '78 Pace, I wanted to keep it orginal and use the stock radio head, so this set up works real nice. The CD is mounted via velcro, and is fully removable. The speakers are difficult to detect as non original. The biggest hurdle I had was the rear speakers. Since modern speakers have a substantially bigger magnet I had to cut and reinforce the brackets on the cover assembly. I worked much of a day on it, but the results were very good. Totally undetectable as anything but stock.