Description
The K&N Filters Universal Clamp-On Air Filter 0.656″ FLNG 2″ ID 3.5″ OD (KNNRU-9920) is engineered for performance-driven enthusiasts who require high airflow and efficient filtration in custom setups. This filter fits tighter spaces with a -0.656-inch offset flange while delivering optimal engine breathing. It is designed with a 2-inch inner diameter and 3.5-inch outer diameter, so it’s perfect for universal fitment in cars, trucks, or off-road vehicles. Washable and reusable, this K&N air filter ensures long service life and consistent airflow to support horsepower gains and engine protection.
Features and Specifications:
- Product Style: Round Tapered Universal Air Filter
- Air Filter Shape: Round Straight
- Air Filter Material: Cotton Gauze
- Inner Diameter: 2 inches
- Outer Diameter: 3.5 inches
- Offset Flange: 0.656 inches
- Engineered Power: Advanced air filter media enhances horsepower, acceleration, and overall engine performance.
- Superior Protection: Four layers of premium cotton gauze with a specialized tacking agent trap harmful contaminants effectively.
- Durable Construction: Built with high-quality materials and precision manufacturing for long-lasting performance.
- Long Service Life: Under normal highway conditions, it requires cleaning only every 75,000 miles, equivalent to about five years.
- Easy Installation: Pre-oiled and ready to use, making it a simple and cost-effective upgrade for better performance.
- Versatile Fitment: Designed for compatibility with a wide range of applications.
- Eco-Friendly: Reusable design helps reduce landfill waste from disposable filters.
- Reliable Warranty: Backed by a 1-year limited warranty for peace of mind.






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