I just purchased the replay and was going to have it installed until the people at Best Buy acted like they had no clue what was going on. My first question is will the PIE adapater work with my single disc head unit? Next is there another way to power up the unit without using the cigarette lighter. I only have one and use it for my cell all of the time. I did search the forums first but could not find anything that I was looking for. Any help is greatly appreciated.