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As far as engine tune. My Canadian dealer advised me it needs to be the BMW power kit to keep the warranty. I'm not 100% sure but I think Dinan takes on the warranty of the power train with their tune. With a $2000+ CAN cost for Dinan at least they back you up. I was told $1200 for the BMW tune to be available later this year (down from list price of $1500). Both those costs are high, but they give you peace of mind.
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