Edelbrock Universal Pro-Flo Conical Air Filter #43691 is an economical way to ensure your engine is getting clean air, without the expense of buying a new filter every few thousand miles. Its constructed for superior filtration and air flow performance. Universal Fit Series is also designed with three inlet adapter rings for use on 3", 3.5" and 4" inlet tube systems. It also feature the Edelbrock exclusive Pro-Charge™ clean strip for easy maintenance. The Pro-Charge strip will let you know when it's time to clean your filter. Rated for use engines making less than 500 horsepower. Each filter comes pre-oiled and is washable and reusable. Use Edelbrock Pro-Charge™ Cleaning Kit #43600 to clean and re-oil.