i have a xe 2004 no rockford, when i pull out the stock hu there is two sets of wiring harness in it. i think one is for the speakers, the second one i think is for the power supply, but i dont know which one. i see four wiring colors, orange, green, black/purple, and black/yellow, i dont know what are these.

Those are speaker wiring for the rears. That is plug no. M50 and should only have four wires. The other plug is M51 and contains front speaker wiring, power, and illumination. See the previous post where I gave all the wiring descriptions.

Here you go:
http://www.velocitymotorsport.com/images/install_notes/113.jpg

thanks for all the info.

thanks, i just finished installing my hu(dvh-p5000mp).it sounds great, but ineed subwoofer, and couple of lcd's next.