Thanks to its extended filtration surface, the airflow to the engine remains at constant pressure. The CRF structure is made of carbon fibre and interfaces directly with the original air-box, providing a perfect seal, easy mounting, and reduced total weight while offering excellent rigidity and mechanical resistance. The filtering element uses a special multi-layer filtration material in RACE configuration, impregnated with low viscosity oil and held between epoxy-coated aluminium mesh to prevent oxidation. This design increases permeability and reduces air flow resistance, ensuring highly efficient filtration. The structure is designed to withstand vibrations and heat generated during both normal road use and intensive track use. - Extended filtration surface maintains constant airflow pressure - Carbon fibre structure provides a perfect seal and reduced weight - Multi-layer filtration material in RACE configuration with low viscosity oil - Designed to withstand vibrations and heat in road and track conditions OEM Cross Reference AUDI 420133843B