I talked with a stereo shop today about installing my deck for me... They said they were going to bypass the factory amp because you wouldn't want to re-amp the already amped signal coming from the pioneer deck. I guess that makes sense. Does this sound correct? This particular shop has never done a Crossfire before so I'm kinda wary of letting them touch my car; I can't seem to find a shop in town that has done a Crossfire though... Any thoughts?