Hey all, I'm sure there is someone out there who has done a head unit wiring harness for a 2003 wrx with premium sound (i.e. 6 speakers + subwoofer). I am curious how this differs from the standard WRX (wiring diagram found here http://www.modifiedlife.com/2003-sub...ation-diagram/). I am attempting to wire up a Pioneer AVIC unit and wish to keep the premium sound intact. Let me know!