Stage 2 Si ProDryS Washable/reusable "oil-free" dry synthetic media Maximum convenience with no re-oiling Deep open pleats for longer service cycle aFe Pro Dry synthetic air filter elements feature an oil-free, 2-layer synthetic filter and a wire mesh outer cover for structural integrity and quality. This provides 50 percent more airflow for better performance, increasing horsepower and torque. They come available for many applications. Pro DRY S provides dramatic airflow increases for improved horsepower and torque performance with 99.2% filtration efficiency, and are easier to service than conventional, oil-impregnated pleated media or foam filters. STAGE 2 Si Horsepower: 11-19 HP gain Torque: 20-40 LB-FT TQ Element: Sealed element: Air filter element is completely enclosed Sound: Quiet Power: Sealed air box minimizes intake noise Style: Molded air box with cover and engineered intake tract Installation: 45-90 minutes: Requires removal of stock air box and intake tract PRIMARY CONCERN CONVENIENCE - Pro DRY S oil free, dry synthetic filtration media is the world's easiest-to-service performance air filter media FILTRATION EFFICIENCY BETTER - 99.2% - Pro DRY S oil-free, dry synthetic media combines excellent filtration efficiency with easy-to-clean convenience TYPICAL VEHICLE GAS / DIESEL - with excellent filtration efficiency and high airflow values, Pro DRY S is the perfect choice for any vehicle type DRIVING CONDITIONS STREET / DUSTY - Pro DRY S will provide extended filter life in normal, everyday driving conditions; in dry, dusty conditions Pro DRY S is an excellent choice for ease and maintenance