Has anyone done any audio upgrades in the F 56 yet? I have a 2015 Thunder Gray with the Harmon Kardon system and its just not quite what I'm used to hearing in my vehicle. I'm not trying to go 4-10's in a wall like in my 07 MCS but I want to do something. Was thinking of using the MS-8 I think it is to integrate the components, or an audio control unit. Does anyone know what the x over settings are on the stock system?