My vote for best thread on the forum. Great work OP. RRT used to make an economical kit for the E46 M3 but have nothing for the E92. My hose should arrive today and I'll play around with it this weekend to come up with a routing that will work for track days but not permanent. I don't have your patience anymore.
2011 E92 M3 AW/SC DCT, ZCV
bought 11/10 sold 9/11