K&N Universal Air Filter - Oval Straight - 3.688in Flange ID x 10.25in Base O/S Length x 7.875in H

K&N Oval Straight Air Filter | 3.688" Flange x 7.875" H | RC-5178

Upgrade engine airflow with the K&N Universal Oval Straight Air Filter (RC-5178). Features a 3.688" flange ID, washable cotton media, and clamp-on design.

The K&N Universal Oval Straight Clamp-On Air Filter is engineered to deliver high airflow, superior engine protection, and increased horsepower across custom intake applications. Designed for maximum versatility, this filter features a durable molded rubber flange with an offset clamp-on design to fit snugly into tight engine compartments where traditional round filters might struggle to fit.

Built using multiple layers of oiled cotton gauze media, this high-flow air filter traps harmful contaminants while maintaining exceptional airflow rates. The top of the filter is finished with a sleek, black powder-coated metal end plate for added structural integrity and a clean look under the hood. Because it is fully washable and reusable, this filter provides a long-lasting performance solution for custom vehicle setups.

Best Uses

1. Custom Engine Swaps & Air Intakes: Ideal for custom automotive builds, hot rods, and engine swaps requiring specialized oval intake configurations.
2. Motorsports & Racing Vehicles: High-flow design provides maximum engine breathability during high-RPM track and drag applications.
3. Heavy-Duty & Off-Road Equipment: Works effectively on custom trucks, tractors, generators, and specialty machinery requiring custom clamp-on air filtration.

Features

1. Oiled Cotton Gauze Filter Media: Utilizes layered, pleated cotton media engineered to maximize air volume while trapping dust and contaminants.
2. Precision Oval Straight Dimensions: Features a 3.688-inch (94mm) Flange ID, 10.25-inch Base Length, and 7.875-inch Overall Height.
3. Flexible Clamp-On Rubber Flange: Built with a 1.5-inch offset rigid rubber flange that absorbs vibration and securely clamps directly to intake tubing.
4. Black Powder-Coated Metal Top: Constructed with a heavy-duty, corrosion-resistant black metal top plate for enhanced durability.
5. Washable & Reusable Construction: Fully cleanable with K&N Filter Cleaner kits, eliminating the need for constant paper filter replacements.

Benefits

1. Boosts Horsepower & Acceleration: High-flow intake media allows more oxygen into the engine, resulting in improved throttle response and performance gains.
2. Cost-Effective Lifetime Solution: Washable design allows you to clean, re-oil, and re-install the filter for the lifetime of your build.
3. High Filtration Efficiency: Provides up to 99% overall filtration efficiency to safeguard engine components against dirt and debris.
4. Optimized Clearance for Tight Spaces: The oval straight profile offers a slim footprint, making it ideal for engine bays with tight top-to-bottom clearance.
5. Easy Clamp-On Installation: Requires no special tools or permanent modifications; simply slip the rigid flange over your intake pipe and tighten the clamp.

This Part Fits: