ok guys, thanks for the tip. I heard L7 in one of my friend's car and since then I have dropped this idea of retrofitting L7. Must say it was good but mine average setup was better then L7 to my ears (actually even the L7 owner agreed)
So today I have ordered MS-8
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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