Not sure which 2001 Volvo S40 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 was one of the smartest buys I've ever made. Increased HP and torque, with better gas milage to boot! And it took me all of 5 minutes to install! I highly recommend this to anyone looking into aftermarket air filtration!" —Richard S from Norcross, GA bought a K&N Air Filters for a 2001 Volvo S40.
"I put a new K&N in my Volvo S40, and noticed about 1.5-3 mpg more on the highway. Got the little baby up to 34 mpg over a mountain pass. Also noticed just a bit more power, I can actually hear my car suckin in the sweet air." —Jonathan P from Seattle, WA bought a K&N Air Filters for a 2001 Volvo S40, 1.9L 4-cyl. engine.