Much like throttle body flaps these open and close to adjust airflow. These ultimately restrict airflow, even when fully open airflow is restricted. This becomes an issue the more the vehicle is tuned.
Remove the runner flaps using our kit to improve airflow in the inlet manifold.
Our precision engineered CNC billet aluminium parts allow you to remove the runner flaps. Our parts replace the runner bearing blocks and the crank arm; sealing the manifold and vastly improving airflow.