I had a look and there would have been space over the DVD Nav system if it wasn't for that silver box (which I don't know what it is...?) It has a black and purple cable attached at the top of it, thin and looks like some sort of antenne perhaps....?

The tapatalk app is not allowing me to upload the photo, no matter the format...sorry about that.

BMW X5 4.8iS 2005

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BMW X5 E53, 4.8iS - 2005
Professional Stereo/Nav with DSP (modified BM54 module) - Converted to Eonon GA5166X with Reverse cam
4-Corner Air Suspension - Converted to BC Coilovers