A replacement Trifoam® Filter Unit for this VWR12G6GT Racing Line Intake. This Trifoam® option is the ultimate filter unit that will deliver optimum power gains. It can be fitted into this Racing Line Intake (including an intake originally fitted with a Cotton filter unit). This is a simple straight Trifoam® Filter replacement unit, ready to drop into your existing Racing Line intake. The choice of Trifoam® filter material gives you the highest airflow for the best possible power for more of the time. However, as a high performance part, regular maintenance or replacement is essential to keep it in peak condition using the Racing Line Filter Refresh Kit to clean and reoil it, or ideally replacement of this filter unit every 10,000 miles. With the option of either this Trifoam® R600 filter or the Pleated Cotton option, the choice is yours. Note: fitment is only for this Racing Line Air Intake.