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Audi A4The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.
I think it's been shown that a K&N does nothing more than screw up your MAF, and since they can be expensive, it ain't worth it. The OEM air filters are pretty good.
Yeah, all the oiled filters are bad... the MAF is right after the air filter in these cars... so the oil can be transfered to the MAF -- clearly bad news.