In theory lowering the front and leaving the back at the existing height should steepen the caster angle and reduce the trail fractionally. The result would be a slightly less self centering effect and perhaps slightly less directional stability. Over the length of the car such a change would be minute and I doubt you would feel it.

Having said that it would be interesting to compare the true (vehicle loaded) caster angle of two M3Ws. One that exhibits bump steer and one that does not.

Peter

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