K&N Engine Air Filter: High Functionality Premium, Washable, Replacement Filter: 1996-2007 BMW L6 (325Ci, M3, X3, 320Ci, 320i, 325Ti and other select models), 33-2231

ENGINEERED POWER: State-of-the-art air filter media is designed to increase horsepower and acceleration as well as improve overall engine Efficiency RUGGED CONSTRUCTION: K&N Air Filters are manufactured with Long-lasting premium materials and state-of-the-art construction methods to last a lifetime 4 LAYERS OF PROTECTION: Multiple layers of premium cotton gauze treated with a specially-designed tacking agent work together to create an intricate mesh of engine filter media that is designed to block and trap harmful contaminants CLEAN ONCE EVERY 5 YEARS: Engine air filter only needs cleaning every 75,000 miles under normal highway driving conditions (5 years based on the average miles driven per year of 15,000 miles) REUSABLE K&N FILTER SAVES YOU MONEY: A K&N washable, reusable air filter will save you up to $125 vs. purchasing multiple disposable filters (compared to MSRP in USD of corresponding OE filters for 200,000 miles of highway driving) ULTIMATE LONGEVITY: No-hassle lifetime limited warranty on stock replacement K&N air filters- limitations apply EASY INSTALLATION: K&N Air Filters are pre-oiled and ready to drop into your factory air box- they are one of the easiest and most cost-effective vehicle upgrades for quick Capability gains REDUCES WASTE: Over 200 million disposable air filters and their packaging waste wind up in landfills each year- reusable filters help reduce waste in our landfills MADE IN USA: K&N Air Filters are proudly made in the USA for trusted quality & reliability Fits Select: 2001-2006 BMW 325 6 Cyl 2.5 L 2005-2006 BMW X3 6 Cyl 3 L 2001-2006 BMW 330 6 Cyl 3 L 1999-2000 BMW 323 6 Cyl 2.5 L 2004 BMW X3 6 Cyl 2.5 L 2001-2006 BMW M3 6 Cyl 3.2 L 2000 BMW 328 6 Cyl 2.8 L 1999 BMW 318 4 Cyl 1.9 L and more - add your vehicle to our fit widget to check