Macht Schnell Stage 2 Intake Charge Kit Benefits: Aids in additional airflow to factory airbox, providing additional gains of 8-12hp! Deeper and more aggressive intake sound Washable/reusable cotton gauze high-performance air filter allows for more airflow Polyethylene construction, nearly indestructible Elegant textured exterior, smooth polished gloss interior for maximum air delivery with no restriction Will not rust, or deteriorate over time Sturdy sidewall construction ensures filter will last the life of the vehicle Tight leak-proof seal with your factory air box Deepest multi-layered pleats increase air flow and maintain critical protection levels, while still providing maximum air delivery Maintains OEM filter's 99% debris collection efficiency to meet ISO 5011 standards Maintains BMW engineered pressurized air box and OEM appearance