I do have NAV. I looked in the trunk and on www.realoem.com for the BM53. I can't find it. The CD changer cord looks like it runs forward in the car towards the head unit. I am planning on replacing the head unit with a wide screen unit -- so the changer doesn't plug into the head unit?

Can you point me closer to the location of the BM53. I have a 2000 X5 with NAV and no DSP.

Thanks.