K&N Audi A4 1.8L Drop In Air Filter 00023 variable bass boost: 0-12 dB

variable bass boost: 0-12 dB at 45 Hz

Part #: RAM-B-166-UN8U

the internal baffle reduces coolant sloshing

lid with gasket and a single bail retainer

Durable Nylon Bezel

K&N Audi A4 1.8L Drop In Air Filter 00023 variable bass boost: 0-12 dBK&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for the majority of vehicles on the road. These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop in design means adding performance is simple. With most vehicles you simply remove the disposable air filter and replace