Thanks RB,

I just read up about dual voice coils and it looks like if I connect all the green and all the green and black, it might make it 2ohm. Still not totally sure.

I have done this with a e39 factory sub box however I don't recall the subs having two sets of wires each. It sounded really nice in the five series so I thought I would give it a shot in the X5.
Just installed an Eonon 5166x and am already the new features.