i just bought a 2006 c350, pretty cool so far. i didnt get the harmon kardon system because i was in the mobile electronics industry for around 4 years, and i wanted to change a few things in the car myself with some better equipment. Does anyone have or know where i can find the wiring diagram for the radio or any related audio parts? Im just looking to add some subwoofers and an amp right now. I havent dug around in the car yet to see if it has a factory amp, even though its not harmon kardon...does anyone know? I dont have Navigation, just single CD with fiber optic changer. Any info would be greatly appreciated. Thanks!