I am new to BMWs but not ICE and Car Stereo installation and am just after a little help with running cables I have today installed a Dension Gateway 500 (AMAZING!) and Gladen Audio factory fit replacements (tweeters 4" mids and 8" underseat subs) with a view to amplifying them from a nice little 4 channel amp I have a Mosconi/Gladen Quadlock Loom that fits inline with the factory wiring to allow me to break out a 4 channel line level signal via RCA to my amps and then feed the amplified signal back into the factory wiring and the uprated speakers meaning no need to run speaker wire into the door In all of my past cars (all VAG actually, an A3, Leon and Octavia VRS) i was spoilt with a huge sill down the side that I could tuck the rcas and signal cables into but on the E61 there is nothing, does anybody have ideas/pics info about ways of doing it? most of the other threads i Can find patch into the signal at the back not behind the dash so they dont need to do this Cheers