Full disclosure - I own a Z4M coupe (S54) and E39 M5 (S62).
From a BMW standpoint, the S54 and S85 sound the best at their lofty redlines. They both sound great to me; since I can hear the S54 at redline without risking a major ticket (unlike the S85, from experience) that is my favorite.
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2020 F87 M2C Hockenheim Silver/MT
2002 E39 M5 Sterling Gray/Caramel
2007 E86 Z4M Coupe Silver Gray/Black
2021 Kia Telluride (hauler)
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