@ifly - Rec'd some feedback regarding the firewall...
"...my second installer told me he ran them through a grommet panel on the drivers side firewall. He said that there is a panel that needs removed, and there will be a bundle of wires going through one large hole, with little grommets around the outside of it for other upgrades or options available from BMW. We just punched one of them out and ran it through there, it worked great!"
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