The OEM HU only outputs 4-channels. For 6-channels just use an RCA splitter:
Originally Posted by sat530d
Hi Technic, are you able to make a 6 channel version of your harness, if so how much would it be?
-2015 F30 320i, Imperial/Oyster, 8AT: August 2014 ED
-2012 E92 M3 Jerez Black/Rust Brown, M-DCT: Gone
-2008 E90 M3 Melbourne Red/Bamboo, 6MT: Gone
-2007 MK5 GTI United Grey/Grey, DSG: Gone
-2004 E46 M3 Carbon Black/Cinnamon, 6MT: Gone