K&N Replacement Air Filter (33-2478) BMW Z4M During our long testing program

During our long testing program we were shocked to see what sort of gains were achievable from this induction kit - the proven results speak for themselves

with a cold-formed stamped band thread

It’s worth remembering that this is with a stock ECU and no tune

Replaces BMW OEM Part 13718601684

Machining High-carbon

K&N Replacement Air Filter (33-2478) BMW Z4M During our long testing programK&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 No Hassle Lifetime Limited Warranty. K&N drop in replacement filters are designed to install easily into your