I was thinking along the lines of the interior wiring: reverse lights, hatch operation, brake interlock, etc. I haven't seen a write up that covers all that M6-A4.
00 Formula Bright Silver A4 Bolt-ons, SS3600 stall, 3.42s; PB:12.37/109.62/1.69
02 Formula SOM M6 lid/catback
09 G8 GT Black/Onyx 19's, sport pkg - stock - wife's car
69 GTO Judge 400 4 spd.
69 GTO 428 TH400