I purchased a 2107 Ford Fusion about 2 months ago with the 400A package and realize that the sound system is just ok. The reason I purchased the base 400a system is because I could not justify speeding $3000 to upgrade when all I wanted was the better sound and larger screen. I did not need any of the other features that came with that package. Now I am stuck with an ok stereo. Does anyone know if it's possible to upgrade the stereo with the sony or an after market Pioneer? I know the Pioneer will mess with the noise cancellation, but I am just curious.