If L7 isn't required H650 is good for its price. I had it for sometime but then went for MS-8 as my primary goal was L7. Also H650 won't support rear pdc if you have.
For signal level I would recommend recoding HU to hifi which produces low level output. Also depends upon what HU have you got.
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650i F12 - HUD, 6WA, SLI, Logic 7, Dynamic and Adaptive Drive, Comfort Access, Soft-close, top-view,
Previous X5 40d M Sports and 535d LCI
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