If you get the "hi-fi" package, you get tweeters in the sail, midrange in the door, 8" midbass/sub under the seat. That unit is coded for a nice flat signal and sends it to the factory amp via balanced low-level inputs. Easy to buy an adapter cable from member here or splice RCA ends on the factory wires.
Technic is on here and the 3 board, but can't find his posts on the harness specifically.
http://www.diymobileaudio.com/forum/...m-harness.html