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I think you took the right decision to go with G-Power. It's a serious tuner and I am sure that the result of the project will be great.
My only concern: will the gearbox handle the new torque level (460+ Nm)?
According to "urban" rumours, the ZF manual gearbox on the E86 Z4M seems to be sort of weak for the task, even for the standard S54B32 engine.
The supercharger is likely to push it beyond the limits.
Have you considered this matter?
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