K&N Engine Air Filter: High Performance, Premium, Washable, Panel Filter: 2009-2017 (520i, 528i, Z4 sDrive 18i, Z4, Z4 sDrive 20i, Z4 sDrive 28i, 528i xDrive, X1, X1 20i, X1 28i), 33-2963

ENGINEERED POWER: State-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%. EASY INSTALLATION: Pre-oiled and ready to drop into your factory air box. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.