K&N Performance Intake Kit

1997–2006 Jeep Wrangler L6-4.0L

57-1521

Overview:

The K&N Performance Intake Kit is engineered specifically for the 1997 to 2006 Jeep Wrangler equipped with the 4.0L inline-six engine. Designed to enhance your vehicle’s breathing capabilities, this intake system increases airflow volume to the engine, resulting in improved horsepower and torque. Ideal for Jeep enthusiasts seeking a reliable upgrade, it delivers measurable performance gains while maintaining durability and ease of maintenance.

This intake kit is perfect for drivers who want to optimize their Wrangler’s power output without sacrificing daily drivability. It offers a straightforward bolt-on solution that enhances engine efficiency and responsiveness, making it a smart choice for both on-road and off-road adventures.

Key Features:

The K&N Performance Intake Kit combines advanced design and quality materials to deliver superior airflow and filtration. Key features include:

• Rotationally molded high-density polyethylene (HDPE) intake tube for increased airflow volume
• Washable and reusable High-Flow Air Filter with oiled cotton media for superior filtration and longevity
• Oversized conical filter design allowing up to 100,000 miles between cleanings under normal highway conditions
• Custom heat shield to protect intake air from engine bay heat, ensuring cooler, denser air reaches the engine
• Guaranteed increase in horsepower and torque backed by K&N’s No-Hassle Lifetime Limited Warranty
• Durable construction designed to withstand harsh driving environments
• Simple installation process typically completed in under 60 minutes

Construction & Design:

The intake tube is crafted from high-density polyethylene (HDPE) using a rotational molding process, which creates a smooth, seamless interior surface that promotes efficient airflow while resisting heat soak. This material choice ensures the tube remains lightweight yet durable, capable of withstanding the rigors of off-road use and high under-hood temperatures.

The included air filter features oiled cotton gauze media, known for its excellent filtration efficiency and airflow characteristics. Its washable and reusable design reduces long-term maintenance costs and environmental impact. The custom heat shield is engineered to isolate the intake air from engine heat, helping maintain optimal air density for improved combustion.

Performance & Sound

By increasing the volume and quality of air entering the engine, this intake kit enhances combustion efficiency, resulting in noticeable gains in horsepower and torque. The system’s design also contributes to a more aggressive induction sound, providing an engaging driving experience without excessive noise. These performance improvements help your Jeep Wrangler respond more quickly to throttle inputs and improve overall engine efficiency.

Installation & Fitment:

The K&N Performance Intake Kit is designed for a direct fit on 1997–2006 Jeep Wrangler models with the 4.0L inline-six engine. Installation is straightforward and typically requires less than an hour, with no permanent modifications needed. All necessary hardware and instructions are included to facilitate a smooth, hassle-free upgrade.

What's Included:

• Rotationally molded HDPE intake tube
• Washable, reusable High-Flow Air Filter with oiled cotton media
• Custom heat shield
• All required mounting hardware and clamps
• Detailed installation instructions

Ideal For:

This intake kit is ideal for Jeep Wrangler owners looking to improve engine performance and throttle response without compromising reliability or requiring complex modifications. It suits daily drivers, off-road enthusiasts, and anyone seeking a durable, long-lasting intake solution that enhances both power and sound.

Emissions Note

Some K&N intake systems are not legal for sale or use on pollution-controlled motor vehicles in California. Please refer to the product specifications for CARB status specific to your vehicle to ensure compliance with local emissions regulations.

K&N is one of the most recognized names in performance filtration, offering reusable high-flow air filters, cold air intakes, and related filters for street and motorsports use. Their products are designed to improve airflow and serviceability—ideal for enthusiasts who want performance-oriented filtration and easy maintenance.