Thanks for the info, just wired up an amp to power a 2x10" cab. I have a 2010 E92 with Logic 7. I can confirm that the wire colors for the left/right subs are correct in this post.
I did not have any solid black wires to use as a ground. The only wires that weren't paired/wound together were the power (red with gray stripe) and ground (brown). I used the red with gray strip as the remote and it works fine. Turns on as soon as you unlock the car, and turns off a few minutes after the car is locked.