Hello.. just found this site while scouring the net looking for audio wiring diagrams. Has anyone installed an aftermarket head unit in an ES300? I want to keep the stock speakers, but I am wondering if I can just splice the wires at the end of the harness or do I have to rewire the whole speaker system? I have the "Premium Sound System" with the trunk-mounted CD changer. I do not intend on using the stock CD changer with the head unit. Any help is appreciated.