Not sure which 2004 Audi A4 Air Filters - Custom Fit is right for you? We have over 14143 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:
"This is probably the fourth car that I've put a K&N air filter in (04 Audi A4), and as usually it was quite easy, with a small power gain. It is definitely noticable, and an easy upgrade which lasts a lot longer than the typical standard air filter. Only thing with this car was how complicated Audi makes it to change the filter. I would not recommend doing the work yourself unless you are confident, and have done things like this before.
It took me about 20 minutes to change it." —Robert H from Brighton, MA bought a K&N Air Filters for a 2004 Audi A4, 1.8L 4-cyl. engine.
"I have always been very satisfied with K&N filters, and this one is not exception. They always fit perfectly and yeild mor MPG and better responsiveness" —Steve P from Colorado Springs, CO bought a K&N Air Filters for a 2004 Audi A4.