Ok, after months of procrastination, I broke down and bought a Qlogic box and pioneer amp and sub. I didnt really know where to start as far as hooking up the stock Nav rb4 unit to my amp. I was told to buy a line converter and some RCAs. I did. I dissasembled the dash, and left door panel. I knew from listening to my system, that the door speakers were responsible for the lower frequencies. So, me being the genius that I am... pull the left front door speaker out to see what color wires were attached to it. They are both DARK GREEN with yellow, and light blue tracers. I dont know which ones are + or -. I checked continuity back thru the cab area and found I could tap into them right near the parking brake pedel area. I opted not to use the converter nor the RCAs, just seemed a wasted step. I wired only the left front door speakers to the amp's speaker inputs, both right and left - I wired together. I only have one sub, so it didnt matter, all it needed was an input. I bridged my amp to my sub. I used a 20 amp fuse from the battery and 10GA wire to feed the amp. for the remote wire, I just tapped off the PINK with yellow tracer wire found near the speaker wires I used. Very painless. I know I was worried about how to wire this head unit up, and had heard many stories on how to, but I finally just used what I know to figure it out on my own. If you have any questions on how do to this... let me know - I will tell you in more detail, and can provide pictures of the install!