Features: Turbo fuel saver fan with single propeller Provides a more dynamic control over the intake system by forcing powerful airflow into the combustion chamber at a high speed Universal fit for air intake hose with diameter between 65mm and 74mm (2.5 - 2.9 inch) Horsepower enhancement and fuel saving capability Come with 2pcs rubber holders Maximum Speed Movement: 55,000R/Min Material: Aluminum Alloy Shell Case + PP Fan Blade