There is a torque limit for the ZF 8AT fitted to the M135i, which is just above the (unmodified).engine's output. In the early days, there was quite a bit of chat about this, but I've not heard of any broken gearboxes. As with all modding, you are taking risks.
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BMW F22 M240i; F48 X1 25i, BMW F20 M135i
Peugeot T9 308 GTi 270
Renaultsport Megane 3 Trophy-R, Renault Clio Sport 182.
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