I have a 2002 sc430 and redid the entire stereo. I left the head unit but installed a JL audio 5 channel amp with a seperate control knob for the subwoofer. I used a polk sub and changed the doors and rear speakers with MB Quarts. I then cut out the ashtray and intalled an xm radio under the door. Very cool looking. The system is unbelievable. Good luck.