I just replaced the sterio with a Pioneer DEHG4000P. The speakers in the doors are infinaty and the instaler said they were good. He also said the the rears were factory original and shot. He also recomended not replacing them because I wouldn't be able to hear them anyway. The new system is a big improvement over the original factory unit but I really think replacing the rear speakers would make a big differance. I could get better sound from a boom box sitting on the rear seat right now.