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Assuming a car that tracks/drives straight and then adding additional caster to one side only would have the effect of making the car want to pull towards the opposite side that has less caster. (or removing caster from opposite side.... same result)
The more the caster angle, the more leverage the weighted wheel has trying to rotate up about the slanted pivot axis.
I used to have a bunch of caster dialed into my oval track dirt car for weight jacking/traction in a turn and that thing would pull like crazy when taking a test drive down a paved straight road. If you let go of the wheel it would drag you off the road instantly.
BMW's have front strut assemblies which form the pivot axis for caster and I think the only way for caster to change would be for a lower arm to have bent back a bit thus lowering the caster (because the lower portion of the strut is now located back a bit). Slight caster adjustment could possibly get done at the top with some aftermarket adjustable strut tower mounting plates but probably not much.
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
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