Lower control arm kit with rear axle camber adjustment for Tesla Model S / Model X — TA Technix

Lowering a car causes the camber to become negative on its own. A little is good for grip; too much, and the tire wears through its inner sidewall within a few thousand kilometers.

These parts bring the camber back into the desired range, or allow you to deliberately add negative camber for track use. Beyond 40 mm of lowering, they are no longer a luxury.