You should look at these;

https://www.woofersetc.com/p-9614-hs...nt-system.aspx

Well, anything that you set using the Mid you will lose....the clock for one, but probably not a deal breaker. I also pulled everything out of my e39, but for my e53 im just going to install AC pieces and Hertz speakers and one, maybe 2 JL amps, oh and the SB.

As far as the 6's in the door...no pain no gain.....