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As the Vario Cam system is controlled by the DME, which you say has an unknown aftermarket reflash, there is absolutely no way of knowing what is causing the issue. If you really want to know, reflash it back to stock, re-dyno the car and see where you are, that is the only way you will know for sure.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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