Treadstone universal Hi-Flow air filters are constructed using ultra strong molded pliable rubber flanges which absorb vibration and allow for secure attachment via worm drive clamps. The inlet can be stretched up to 1/16" or clamped down 1/8" for use on in between sizes. Filter can be washed and reused, no need for oiling. Great for turbo application! Lifetime warranty on all of our filters!