I have replaced the four door speakers and I am looking to replace the head unit in my wife's Pilot. Has anyone done just this? Was there an improvement in the sound quality? CD's sound great w/ the new speakers but FM/AM still don't sound clear. Also, how did you hook up the speakers on the new head unit? I am not opposed to adding a single amplifier to run the 4 door speakers and the sub but I would rather not if I can get by w/out one. Has anyone done this or anything similiar? Were you able to use the steering wheel controls? I have the Crutchfield install guide and have seen the wiring diagram for the speaker hook up. If I end up having to hook up an amp, I was thinking of hooking up the tweeters to the head unit speaker leads so they wouldn't be wasted. Any thoughts/ideas are appreciated.