Not sure which 2003 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:
"Filter didnt improve performace noticably, but you can hear the engine a little better now, and I wont have to worry about replacing it for a long time." —Jesse V from Manchester, NH bought a K&N Air Filters for a 2003 Audi A4.