Q: Where will I actually feel the extra rear grip?

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.