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Can't help unfortunately but well, these are complicated engines and fairly sensitive to changes due to the myriad of sensors. Lastly there are simpler ways of getting more BHP out of these cars and I've never really met or talked about these things with people in Europe especially with BMW's .From memory its something the Scooby and Mitsui guys do more often on heavy builds.
From what I know it just helps with tolerances on high tunes.
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