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Dedicated track menu options in iDrive that include things like oil pressure, boost pressure, brake temps, built in lap timer, telemetry readings, being able to temporarily disable TPMS to run at lower pressures, and whatever else cars like McLarens and Corvettes and Porsche GT3 have that help drivers monitor track performance.
Not ever gonna be in any OEM car or have much purpose in a M car, but rolling launch control would be sick to have too.
Removable harness bar with seats that accept a harness.
Ability to select a shorter steering ratio for the track
Brake cooling ducts
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