Track days. The flap adds rear stability during high speed sessions, which shows up in braking zones and long sweepers. If you want structured seat time in a Tesla-only paddock, the TeslaCorsa Track Day Experience runs exactly that, and drivers moving toward harnessed lapping can add the Unplugged Performance x Willans FIA 2025 Racing Harness as the cockpit catches up with the aero. Public-road benefit is minimal because the flap only generates meaningful downforce at higher speeds.
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