K&N Universal Air Filter Chrome Round Tapered Red -4in Flange ID x 1.125in Flange Length x 5.5in H

K&N Universal Air Filter Chrome Red | 4" Flange, 5.5" H (RG-1001RD-L)

Boost performance with the K&N Chrome Round Tapered Red Air Filter. Features a 4" flange ID, 5.5" height, washable design, and high-flow filtration.

The K&N Universal Air Filter RG-1001RD-L is engineered to increase horsepower and acceleration by delivering up to 50% more airflow than traditional paper filters. Featuring a high-flow, oiled cotton media in a vibrant red finish, this filter provides exceptional engine protection by capturing contaminants while allowing maximum intake performance.

It comes equipped with an attractive chrome top and a flexible, molded rubber flange that absorbs engine vibration for a secure, tight fit. The tapered cone design ensures easy clearance in tight engine bays. Fully washable and reusable, this air filter is built to last the lifetime of your equipment, reducing waste and replacement costs.

Best Uses

1. Custom Cold Air Intakes: Ideal for custom engine builds, hot rods, and modified street cars requiring a 4-inch intake pipe connection.
2. Track & Racing Vehicles: Suitable for high-RPM setups where maximum unrestricted airflow and engine response are vital.
3. Engine Swaps & Tight Spaces: The round tapered (cone) shape fits easily into compact engine bays with limited overhead clearance.
4. Power Equipment & Custom Builds: Great for tractors, generators, or custom motor setups needing reliable, high-flow filtration.

Features

1. High-Flow Cotton Media: Constructed with multiple layers of oiled cotton gauze to maximize airflow without sacrificing filtration.
2. Pliable Molded Flange: Features an ultra-strong, vibration-absorbing rubber flange with a 4" inner diameter and 1.125" length.
3. Chrome Top Plate: Styled with a polished chrome top for a clean, custom aesthetic under the hood.
4. Round Tapered Shape: Measures 6" base diameter, 4.75" top diameter, and 5.5" overall height for optimized intake velocity.
5. Washable & Reusable: Designed to be cleaned and re-oiled using a K&N Recharger kit for long-term usability.

Benefits

1. Increased Horsepower & Acceleration: High-airflow design feeds more cool air into your engine, helping improve combustion power.
2. Long-Term Savings: Eliminates the need for frequent disposable paper filter replacements over the life of your vehicle.
3. Engine Protection: Traps dirt and harmful debris down to microscopic levels to safeguard engine components.
4. Flexible & Secure Fitment: The pliable flange can stretch up to 1/16" (1.5mm) to accommodate slightly off-spec inlet pipes easily.
5. Eco-Friendly Choice: Reusable design reduces environmental waste from discarded single-use filters.