Description Replacement Air Filters for our Increasingly popular PSDesigns BMW S54 Velocity Stack Conversion, the most complete conversion available for the BMW S54 Engine, as found in several BMW M Power Cars including the BMW E46 M3 and the BMW Z4M. The Tri-Foam System Why foam? Because, compared to paper or other filter technologies, reticulated polyester foam achieves optimum performance against three key criteria: Maximum Air Flow The ability to allow air to pass through without causing a large drop in pressure. Cleaning Efficiency The capability to arrest a high proportion of airborne dust while feeding the engine clean air. Dust Load-up Tolerance The capability to absorb a large amount of dust without reducing air flow capacity. Individual socks should be fastened down with a cable tie or jubilee clamp to hold them securely in place. Please note: price is per filter sold.
