THIS AIR FILTER INSTALLS UNIVERSAL. AIR FILTER ADAPTER MIGHT BE REQUIRED! ADAPTER NOT INCLUDED. SKILL REQUIRED FOR INSTALLATION! FLANGE INTERIOR DIAMETER: 2.677" - 68 mm BODY DIAMETER: 4" - 100 mm LENGTH: 4.4" - 110 mm * Twist-R filters are designed to dramatically reduce intake restriction allowing more air flow to your engine & to create perfect spiral air flow. The Special Threaded Ring speeds up the incoming air charge in the intake. More & regulated air means more usable power & acceleration throughout the engine's RPM range. Twist-R concept was developed to improve low-range & mid-range power, torque & fuel efficiency. Add 2-8 HP to your power train & save fuel. Magnum Vortex pays itself & lasts for a lifetime. * Improves engine performance by up to 5 %. * Increases economy by up to 10 %. * Enhances torque & acceleration smoothes out throttle response,. * Lifetime duration * Noticeable improvement in acceleration throughout the RPM range. You will receive an in-built throttle body spacer with your Twist-R. The air filter is a critical component of your engine. A properly maintained high performance air filter is essential to the life & output of the engine. Magnum Cleanable & reusable high grade filter media reduces air restriction & increases engine output. Precision pleat geometry optimizes airflow throughout the intake system, thus, increasing horsepower. Vortex Spiral works as a Throttle Body Spacer called TBS. Throttle body spacer causes the incoming air to tumble for mixture's perfect atomization into the combustion chamber. THIS TWIST-R INSTALLS UNIVERSAL. AIR FILTER ADAPTER MIGHT BE REQUIRED. DOESN'T FIT TO INTAKES HAVING LARGER INTERNAL DIAMETER! Magnum Tuning has been dealing with manufacture of upgrades since 1994. Magnum's experience warrants peak performance, reliability & perfect style. Magnum Parts are made in Europe & covered by 10-YEAR WARRANTY.