Saying without a pro driver you can't evaluate the part is disingenuous.. he's reporting his results with a part. News flash: none of you are pro drivers either. If he can't get better lap times out of the supercharger for whatever reason, then chances are, those reasons might apply to you too. Identifying the reasons is fine, but lets not go overboard with the "you're not a pro driver, your results don't matter" nonsense.
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2008 E92 335i MT