Aside from the stiffer bushes, the design isn't all that good with the hard race front camber arms.
If you have lowered the ride hight the camber arms contact the shock towers near the inner bushes on bigger bumps. Even going up driveway too fast can cause them to hit.
If you have very stiff springs you might get away with very little contact, but usually the arms contact the chassis before the damper reaches the bump stop.
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