Not only because some customers are not only looking for increased performance out of an air filter but are also looking to make their intake/exhaust noise a signature of their cars.
Made of high-strength and environmental protection material, durable and very easy to install.
Dual-layer Hengyou filter with Active Carbon.
This filter is absolutely essential for allergy sufferers designed to filter smoke, dust, pet dander, pollen, mold pores, fabric and other allergen air borne elements, keeping the fresh air from being polluted and prevent the secondary pollution.
Recomend to change filter once every 6 months, or dependent on usage.