Not for sure about cheapest, but Crutchfiel.com is a good place to start. They will give you everything you need to install plus good tech. support.

 

I recently installed this stereo, but when unplugging the stock head unit, i noticed there were 2 wiring harnesses plugged into it. Crutchfield only sent me one harness. The new unit works fine and everything, but I was wondering what the other plug is that was on the stock stereo? I just left it unplugged.

Is it for the speed sensitive volume adjustment or something? Just wondering what it exactly is that I left unplugged. I'll post some pics later of my install!

 

 

that isnt the AVH-P4000 DVD is it?

 

I have the same unit, but no zune or ipod. Is there a way to load from a cd? I know that usb is for audio only.