Oil Cap/CCV Breather Adapter (Mk3)(B4)(Mk4 ALH)

This breather adapter comes from the 2.0 VW engine and lets more airflow in the highly modified TDIs.

It also fits the oil cap on the valve cover assembly of many 1.9L TDIs, creating a second breather location for the cylinder head. This allows the 2.0 engine to vent excess pressure within the cylinder

head, providing an increased flow of oil to the head and turbo. This is especially beneficial in those TDIs that have been modified for higher power and torque.