K&N Air supply system 57i Series; Gen I 57-0648-1 (wet filter) BMW 1 (E81), 1 (E82), 1 (E87), 1 (E88), 3 (E46), 3 (E90), 3 (E91), 3 (E92), 3 (E93), 3 (G20, G80, G28)

For over 50 years, K&N® has been an industry-leader in automotive filtration and technology—offering products to increase performance, protection, and longevity in thousands of vehicle applications worldwide.
In addition to performance air filters, K&N® manufactures a variety of other protection and performance products, including air intake systems, oil filters, fuel filters, cabin air filters, and home air filters. Over the course of five decades, K&N® have built a reputation for exceptional quality.