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Those look OEM, wouldn't expect non to have the BMW inscription. Did you check the spark plugs? These motors prefer fresh plugs. Another thing to check is the ground wire going to the rear lug on each of the valve covers (that silver lug to the far left of your pic that the plastic cover clips too, that's the forward one) Also there is a lower braided ground wire that goes from the chassis to right near the driver's side motor mount.
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