This performance air filter replaces the highly restrictive stock paper filter in the Focus Mk2 & Mk3, plus the Focus RS Mk2 Air Cleaner.
Designed as a direct replacement, this filter offers better breathability by reducing the restriction by 20%, but with the pre-oiled cotton media, the filtration efficiency still remains high ensuring excellent engine protection
This performance Air Cleaner Cover replaces the standard Air Cleaner Lid and Inlet Duct Upper on the Ford Focus RS Mk2.
With an increased intake effective cross sectional area, and improved air cleaner internal volume, the air cleaner's restriction has dropped by 50%. This allows more air into the system boosting power by up to 15bhp. The installation is simple and quick, no modifications are required, and full instructions are included.