May be different over the current generation model years (I have an '03). The JBL premium system comes with 10 speakers vice 6 for std. In the right rear it has a sub-woofer with an Harmann-Kardman (sp?) attached amplifier. The std radio has mirrors in the upper rear inside back corners - the JBL version has speakers there instead (I would have like the mirrors personally). Due to the rear amp placement the audio wiring is different in the vehicles. The JBL unit will not work without the rear amplifier and nomal unit could not be plugged into the JBL wiring. Hopefully some more audio-phile folks have more details - like amp power output, resistance of speakers (4 OHM?), speakers power handling capability?