Keep in mind that the Z4 M40i comes stock with the same M-like 100% locking torque-vectoring LSD.
It would have better traction than the one-wheel peel 240i even with the optional mechanical locking 30% diff.
I'm sure that also factored in when BMW decided to unleashed more power from the B58 in the new Z4.
More power is no fun if you just going to have wheel spin or hop and can't get that extra torque down properly to the ground.
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