Type: ITG Maxogen air filter with Tri-Foam, TNBConnection outer diameter: 83mm Dimensions (see picture for explanation):A: 80mmB: 83mmC: 180mmD: 55mmE: 215mm BHP rating: 450 hpitg were probably the first company to manufacture a truly durable, high performance foam-based production air filterWhy foam? Because, compared to paper or other filter technologies, reticulated polyester foam achieves optimum performanceagainst three key criteria: Maximum Air Flow The ability to allow air to pass through without causing a large drop in pressure. Cleaning EfficiencyThe capability to arrest a high proportion of airborne dust while feeding the engine clean air. Dust Load-up ToleranceThe capability to absorb a large amount of dust without reducing air flow capacity. Do not forget to buy filter oil as these filters must be oiled before use.