Not sure which 2003 BMW 5-Series 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:
"Every car I have runs with K&N filters for a reason. I'm very happy with the performance I receive." —Curtis G from Nipomo, CA bought a K&N Air Filters for a 2003 BMW 5-Series, E39 chassis, 525i, 2.5L 6-cyl. engine.
"I just replaced air filters in both of my vehicles, with K&N's. 88 RX7 conv. and 03 BMW 5 series wagon. Happy with performance increase due to better air flow. I was told by my mechanic to use the oil sparingly as too much can damage mass air flow sensor. That's my concern for my BMW." —James D from Bridgeville, PA bought a K&N Air Filters for a 2003 BMW 5-Series, E39 chassis, 525i, 2.5L 6-cyl. engine.