The most important component of any air intake kit is the air filter. We include only the best performing, most hydrophobic air filters in motorsport with all of our intake kits – manufactured in England by Ramair Filters, the PRORAM series of filters offers superior airflow, filtration, water resistance, and real-world performance regardless of weather conditions. We've used PRORAM filters in our F10 M5 shop car for over 30,000 miles in every possible driving condition, both on the street and track.