Not sure which 2003 BMW 3-Series 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:
"I always use K&N Air Filters! They increase horsepower and improve gas mileage, which is nice. They are a lifetime filter if you clean them every few years, so they are cheaper in that respect. And using K&Ns reduces the amount of air filter trash in landfills. Can't go wrong, IMO!" —Sean C from Marlborough, NH bought a K&N Air Filters for a 2003 BMW 3-Series.