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It is placebo effect which can be pretty convincing as multiple randomized drug trials have shown.
I have driven the '11 ZCP. It does not feel any faster and engine responsiveness is identical. I will say that it does seem somewhat tighter around corners than older models but this is not a hugely significant difference in my opinion.
And, in answer to the hopefully sarcastic post above, the ZCP does not add HP or torque relative to the non-ZCP M3.
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