Not sure which 2004 Audi A4 Air Filters are right for you? We have over 14810 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"One of the first mods I make with all my vehicles is to change out the OEM air filter for a K&N unit. The advertised benefits are felt immediately varying a bit from vehicle to vehicle with respect to ease of installation, sound, power gains and fuel economy. The quality of the premium filter is second to none and I like the green idea of washing and reusing the filters.Though the filter is relatively not cheap, you can't go wrong here with the best" —Vincent H from San Francisco, CA bought a K&N Air Filters for a 2004 Audi A4.