K&N RU-4550 High-Flow Original Universal Air Filter – 4 Inch Flange Reusable Washable Performance Engine Intake Filter – Up to 99% Filtration

Product Description :

K&N RU-4550 High-Flow Original Universal Air Filter

Boost your engine's performance with the K&N RU-4550 High-Flow Original Universal Air Filter, engineered to deliver increased horsepower, quicker acceleration, and superior engine protection. Featuring K&N's premium four-layer oiled cotton gauze filtration media, this reusable air filter provides exceptional airflow while capturing harmful contaminants with up to 99% filtration efficiency.

Designed as a long-lasting alternative to disposable paper filters, the K&N RU-4550 is washable and reusable, reducing maintenance costs and environmental waste. Under normal highway driving conditions, the filter requires cleaning only every 75,000 miles, making it one of the most reliable performance upgrades for your vehicle.

With a 4-inch (102 mm) centered flange, durable rubber construction, tapered round design, and a 5.375-inch base diameter, the RU-4550 is ideal for custom air intake systems, cold air intakes, performance vehicles, trucks, SUVs, off-road builds, and motorsport applications.

Pre-oiled and ready to install, this universal air filter offers an easy upgrade that enhances airflow, improves throttle response, and helps maximize engine efficiency.

Key Features :

• Genuine K&N RU-4550 High-Flow Universal Air Filter

• Increases horsepower and engine acceleration

• Improves airflow and throttle response

• Premium 4-layer oiled cotton gauze filtration media

• Up to 99% filtration efficiency

• Washable and reusable lifetime air filter

• Requires cleaning only every 75,000 miles under normal driving conditions

• Durable rubber flange construction

• Pre-oiled for quick and easy installation

• Universal fit with 4-inch (102 mm) flange

• Helps reduce disposable filter waste

• Suitable for cars, trucks, SUVs, racing, and off-road vehicles