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The correct part number for a 2021 X3 M40i is a 33-3134. Ordered one off of Ebay, and it's a perfect fit. On the K&N site it does not come up for a 2021, but does for a 2020.
The other model, # 33-3079, indicates that it is NOT for the B58D engine. Just think their website needs to be updated.
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"Horsepower is a terrible thing to waste."
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