I run my M3 on tracks in the SF bay area like you. Usually I'm running with Speed SF, OnGrid and Lightspeed.
My stock brakes served me for 13+ years of track days. All you need is track brake pads and brake fluid. You'll be perfectly fine with stock brake calipers and rotors. Towards the end of a 20 min session, you'll get some brake fade. But 200tw tires usually give out before 20 min so you won't be lapping at full pace towards the end of a session anyway.
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