Congratulations! Tanzanite blue is a beautiful color. Almost ordered our M 340i in it until we realized we already had three blue cars ('06 M Roadster, '11 E93 M3 and '20 X3 M40i; ordered Oxide Grey instead). Both the M3 and M Roadster sound amazing with the top down as their power peak is way up the rev range (both are 6 speeds). The M 340i and X3 M 40i are no slouches in the sound department either. I can relate to your enjoyment of the engine sound in your M4 with the top down.
Wish we had twistier roads here in Florida (but we have "Florida Man", which can get twisty).
Best
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