K&N Engineering E-3730 Custom Round High-Flow Air Filter

K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's 10-Year/Million Mile Limited Warranty. K&N drop-in replacement filters are designed to install easily into your factory air box. Upgrade today and start enjoying superior airflow and superior performance from K&N's most popular product! K&N's replacement High-Flow Air Filters are designed to increase horsepower while providing exceptional engine protection, and are covered by K&N's No-Hassle Lifetime Limited Warranty. Associated products: 25-3750 Air Filter Foam Wrap, 25-5500 Air Filter Foam Wrap, E-3750PK Air Filter Wrap, E-3750PY Air Filter Wrap, 99-5000 Filter Care Service Kit Aerosol

• Will not void vehicle warranty
• Million Mile Limited Warranty

Upgrade your vehicle’s air intake system with the K&N Engineering E-3730 Custom Round High-Flow Air Filter. Designed as a reusable replacement filter, it uses layered, oiled cotton media to promote increased airflow while capturing dirt and other airborne contaminants. The high-flow design supports improved engine breathing and is engineered to help increase horsepower without requiring major modifications to the factory or custom air intake system.

The K&N E-3730 is washable, reusable, and built to serve throughout the life of your vehicle when properly maintained. Its durable construction provides exceptional engine protection while reducing the need for frequent disposable filter replacements. The filter is compatible with K&N Filter Care Service Kit Aerosol and select K&N Air Filter Foam Wrap products, including 25-3750, 25-5500, E-3750PK, and E-3750PY. Installation and servicing should follow the vehicle or intake manufacturer’s recommendations.

This automotive air filter is backed by K&N’s 10-Year/Million Mile Limited Warranty and is designed not to void the vehicle manufacturer’s warranty when properly installed and maintained. The K&N Engineering E-3730 is intended for custom round air intake applications and should be matched to the correct intake housing and sealing surface before installation. California emissions approval is not specified for this application; verify local requirements and vehicle fitment before purchase.

Product Specifications and Technical Data

• Brand: K&N Engineering
• Part Number: E-3730
• Product Type: Automotive high-flow air filter
• Filter Style: Custom round replacement filter
• Filter Media: Layered, oiled cotton media
• Serviceability: Washable and reusable
• Warranty: 10-Year/Million Mile Limited Warranty
• Application: Custom air intake systems requiring a compatible round filter

What’s Included

• One K&N Engineering E-3730 Custom Round High-Flow Air Filter

Fitment

Fitment data should be confirmed against the vehicle, intake system, and filter housing before installation. This filter is intended for applications compatible with its round mounting configuration.

Features:

• High-Flow Airflow Design: Layered, oiled cotton media is engineered to improve airflow and support increased horsepower.
• Washable and Reusable: Can be cleaned and reused throughout the life of the vehicle when properly serviced.
• Enhanced Engine Protection: Helps capture dirt and airborne contaminants while maintaining efficient airflow.
• Long-Term Warranty Coverage: Backed by K&N’s 10-Year/Million Mile Limited Warranty and designed not to void the vehicle warranty when properly installed.

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1