K&N RC-5178 Universal High-Flow Air Filter (Oval Clamp-On)

Vehicle Fitment

• Universal application - fits a broad array of vehicles, racing vehicles, off-road rigs, specialty equipment, generators, tractors and custom intake systems. Dimensions must be verified before installation.

Features

• High-flow washable and reusable performance air filter media
• Layered oiled cotton-gauze construction for enhanced airflow and effective filtration
• Designed to improve horsepower and throttle response by reducing intake restriction
• Rigid clamp-on flange for mounting to intake hoses or adapters - no vehicle-specific housing required
• Durable construction engineered for long-term use under normal conditions
• Eco-friendly reusable design reduces waste compared to disposable filters
• Pre-oiled for immediate use out of the box
• Backed by K&N's limited warranty for universal filter applications

Specifications

• Shape: Oval Straight
• Base Outside Length: 10.25 in (260 mm)
• Base Outside Width: 7.188 in (183 mm)
• Top Outside Length: 9.00 in (229 mm)
• Top Outside Width: 5.375 in (137 mm)
• Height: 7.875 in (200 mm)
• Flange Inside Diameter: 3.688 in (94 mm)
• Flange Outside Diameter: 4.00 in (102 mm)
• Flange Length: 1.00 in (25 mm)
• Flange Offset: 1.50 in (38 mm)
• Filter Media: Multi-layer cotton gauze, oiled
• Weight: approx. 4.2 lb (1.9 kg)
• Filter Re-Oiling Amount: ~7.57 oz (224 ml)

Included Components

• 1x K&N RC-5178 Universal High-Flow Air Filter (pre-oiled)

Product Description

The K&N RC-5178 is a premium universal high-flow air filter designed for use in custom and performance applications where vehicle-specific filters may not suffice. Its large oval footprint and clamp-on rigid flange provide flexibility to mount on intake hoses, custom piping or non-OEM setups. The washable and reusable cotton-gauze media allows high airflow while retaining strong filtration, giving you performance benefits and long-term value.

Installation is simple: select the appropriate intake hose or adapter, clamp the RC-5178 securely using the flange inside diameter of approximately 3.688 in, and ensure clearance around its 10.25 in x 7.188 in base footprint. Because this is a universal filter, verifying intake tube diameter, surrounding clearance and flange compatibility is crucial for proper fit and performance.

Designed for builders, racing teams, off-road rigs and specialty equipment, the RC-5178 offers a reusable and performance-oriented upgrade. Backed by K&N's reputation and limited warranty, it's a strong choice for applications where higher flow and adaptable fitment are required.