The fluid and pads are a great start. In my Viper GTS, the fluid made a good improvement, and I used Pagid on my Porsche 993... they had less fade, but were prone to serious noise (I recall a Pagid street/track pad like RS-4 or something). I recall that air deflectors worked well on the Viper... but don't know if they would fit well on M5.
Dan
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