morning,
I have a 2004 530i and i was wondering what’s the better air filter to replace the factory one with K&N or AFE??? and recommendation?? Has anyone notice any mpg improvement once doing this?
I think thoses type of air cleaners are for Buggies and Bikes and have no place under the hood of a BMW. Just the oil additives alone trash the intake MAF sensors with oil and dirt . If it was a good idea BMW would of already done it.
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