Wagner Tuning Competition Air Filter RS3 / TTRS / RSQ3An affordable and must have upgrade! Competition Air Filter RS3 TTRS RSQ3Plug and PlayDue to the increased air flow of the WT Competition Air Filter, the engine is supplied with oxygen in the best possible way. The WT Competition Air Filter is equipped with a synthetic material which doesn't need filter oil. The advantage of a not oiled air filter is that the mass airflow sensor is not getting contaminated or even damaged by oil vapors, as it could