K&N Flow Control Custom Assembly (61-2000) Volkswagen > Golf > MK8 > GTI access the valve piston by

access the valve piston by removing the 3 cap screws at the base of the valve and simply clean the piston chamber using brake cleaner or similar cleaning fluid before installing the new spring and piston

Testing during the development of this bush has indicated stiffness gains of 128% compared with the original rubber bush

Easy to install

Similar to many of the newer VAG engines

Later cars may use a larger (nonadjustable) 45mm bush PFF3-501

K&N Flow Control Custom Assembly (61-2000) Volkswagen > Golf > MK8 > GTI access the valve piston byThe K&N Flow Control System utilizes a custom designed base in combination with a unique lid designed to reduce intake turbulence. The resulting smooth, laminar flow enhances cylinder filling, horsepower, and torque. The filter element is the world famous K&N Filtercharger for the ultimate in airflow and filtration. Custom design reduces intake turbulence Includes K&N round filter element High air flow with excellent filtration Washable and reusable