K&N 57-2581 Engine Cold Air Intake Performance Kit

Performance Intake for Ford F-150

The K&N 57-2581 is a Gen II cold air intake performance kit built for the 2011-2014 Ford F-150. It uses a high-density polyethylene intake tube and a custom heat shield to help manage incoming air temperature while improving airflow to the engine.

Key Features

• High-density polyethylene intake tube for improved airflow volume
• Washable, reusable oiled cotton gauze air filter
• Oversized conical filter design for extended service intervals under normal highway driving
• Custom heat shield helps isolate intake air from engine-bay heat
• CARB EO D-269-48 and street legal in all U.S. states
• Estimated horsepower gain of 12.05 HP at 5304 RPM
• Replacement filter: RU-5173

Detailed Description

Designed as a performance upgrade for the Ford F-150, part number 57-2581 combines a rotationally molded HDPE tube with a pre-oiled cotton gauze filter to support stronger airflow through the intake tract. The 57 Series FIPK layout uses a heat shield and included MAF sensor adapter when required, helping the system integrate with the specified application while maintaining a clean, serviceable design. K&N lists this intake as street legal in all U.S. states with CARB EO D-269-48, and the system is backed by a 1,000,000-mile/10-year warranty.

What It Is Used For

• Replacing a restrictive factory intake assembly
• Improving airflow into the engine
• Supporting throttle response and power output
• Reducing heat soak with a shielded intake layout
• Extending filter service intervals with a washable element

Installation Notes and Tips

Fits 2011-2014 Ford F-150, N/A. The system is typically installed in less than 90 minutes. Verify CARB status for your specific application before installation, and follow the included application requirements for MAF sensor adapter use. Mounting hardware is listed as included in the product data.

Quality Assurance

K&N backs this intake with a 1,000,000-mile/10-year warranty. Part number 57-2581 is engineered for the specified application and carries CARB EO D-269-48 for street-legal use in all U.S. states.