I have the REC Nav unit with BA,and eventually I want to upgrade to an aftermarket head unit so I can have Sat radio and an aux input and be able to properly adjust the tone settings. So, I've decided I will just bypass the BA amp all together, as I have heard the BA amp can muddy up the sound quality with an after market stereo. Although i'm not sure that is true. Maybe some one can enlighten me? Another thing i'm wondering about is the compatibility of the stock BA speakers with an after market stereo. I was under the impression that they work off of different ohms or something. Again, that's just what i read somewhere. I would rather not have to replace all of the speakers. So if anybody can throw me their 2 cents, it will be much appreciated.