Product Summary

The K&N RU-4550 Universal Air Filter is built to deliver exceptional engine performance with high airflow and up to 99% filtration efficiency. Designed for easy installation and long-term use, this rugged, washable air filter offers a powerful upgrade over stock options while helping reduce environmental impact.

K&N RU-4550 High-Flow Universal Air Filter – Performance Boost with Long-Lasting Protection

Engineered for enthusiasts who want to unlock their vehicle’s potential, the K&N RU-4550 Air Filter offers improved horsepower, long-term durability, and eco-conscious performance.

Engineered Performance

• High-Flow Filter Media – Specially designed to enhance horsepower, acceleration, and overall engine responsiveness.

• Maximized Efficiency – Provides up to 99% filtration efficiency while maintaining optimal airflow.

Advanced Filtration Technology

• 4-Layer Cotton Gauze – Premium oiled cotton media captures harmful contaminants effectively.

• Tacking Agent Treated – Creates a fine mesh structure to trap particles without restricting airflow.

Durability & Sustainability

• Rugged Build – Made with top-grade materials for lifetime use under extreme conditions.

• Washable & Reusable – Clean once every 75,000 miles under normal highway driving.

• Eco-Friendly – Reduces landfill waste by replacing disposable filters.

User-Friendly Design

• Easy Installation – Pre-oiled and ready to install; fits a wide range of vehicles.

• Universal Fit – Centered flange design ensures compatibility with multiple intake setups.

• Low Maintenance – Long service intervals reduce time and effort for upkeep.

Added Value

• 1-Year Limited Warranty – Peace of mind guaranteed.

• Reusable Investment – A smart and cost-effective upgrade for performance enthusiasts.

Technical Specifications

• Air Filter Material: Cotton Gauze

• Washable: Yes

• Air Filter Shape: Round Tapered

• Flange Inside Diameter: 4 in (102 mm)

• Flange Length: 0.625 in (16 mm)

• Flange Type: Centered

• Height: 6 in (152 mm)

• Top Material & Style: Rubber

• Top Outside Diameter: 4.5 in (114 mm)

• Base Outside Diameter: 5.375 in (137 mm)

• Weight: 1.3 lb (0.6 kg)

• Filter Oil Capacity: 1.06 oz (31 ml)

• Filter Line: High-Flow Series

• Efficiency: Up to 99%

• Warranty: 1-Year Limited

• Color: Red

• Package Includes: 1 Air Filter

• FAQs

  Q1: Is the K&N RU-4550 reusable?
  Yes, it is washable and reusable, designed to last a lifetime under normal driving conditions.

  Q2: How often should I clean the filter?
  Clean every 75,000 miles or approximately every 5 years under normal highway driving.

  Q3: What makes this filter eco-friendly?
  It replaces disposable filters, reducing landfill waste significantly.

  Q4: Is it easy to install?
  Yes, it comes pre-oiled and is designed for quick, hassle-free installation.

  Q5: What vehicles is this compatible with?
  It has a universal fitment and is compatible with a wide range of applications using a 4-inch flange.