K&N IS300 Drop In Air Filter 2018-subaru-wrx-sti-esi1823129 Adjustable diaphragm bypass valve outperforms

Adjustable diaphragm bypass valve outperforms ineffective poppet designs

RB817 is a high quality

able to drop the charge air temperatures approximately 150ºF

we've designed an extended drain port with a slotted drain plug

6 Liter K50

K&N IS300 Drop In Air Filter 2018-subaru-wrx-sti-esi1823129 Adjustable diaphragm bypass valve outperformsK&N washable, reusable High Flow Air Filters feature a state of the art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's 10 Year Million Mile Limited Warranty. K&N drop in replacement filters are designed to install easily into your