Cold Air Intake for Jeep Grand Cherokee (1999-2004) 4.7L

High-Flow Cold Air Intake for 1999-2004 Jeep Grand Cherokee (4.7L PowerTech / WJ)

What it Does: This 3.5-inch polished aluminum cold air intake replaces the restrictive factory air box on the 4.7L V8 to lower intake air temperatures, optimize volumetric efficiency, and increase throttle response.

The Stock WJ Air Intake Shortcomings

The factory air intake system on the 1999-2004 WJ Grand Cherokee was engineered primarily for NVH (Noise, Vibration, and Harshness) reduction rather than performance. The OEM plastic air box and corrugated intake tract create severe turbulence and airflow restrictions, limiting the breathing capability of the 4.7L PowerTech V8 engine. Under sustained load—such as off-roading, towing, or slow-speed rock crawling—the restrictive factory plastic housing suffers from localized heat soak. This forces the engine to ingest hot, less-dense air, ultimately resulting in sluggish throttle response, reduced low-end torque, and compromised engine efficiency when you need consistent power the most.

The Engineering Solution

To solve these airflow limitations, this cold air intake system utilizes a 3.5-inch outer diameter, mandrel-bent T-6063 aluminum intake tube. The smooth internal surface of the T-6063 aluminum eliminates the turbulence caused by the factory ribbed hoses, maintaining a high-velocity, laminar air path directly to the throttle body. The polished finish helps reflect ambient engine bay heat, while the included high-flow dry air filter substantially increases the total filtration surface area without relying on heavily oiled media that can foul MAF/MAP sensors. Featuring dual filters for maintenance rotation and rugged PVC couplers for vibration isolation, this system is specifically designed to maximize off-road breathing capability and airflow dynamics.

Technical Specifications

Compatibility

• 1999-2004 Jeep Grand Cherokee 4.7L V8 (Automatic Transmission)
• 1999-2004 Jeep Grand Cherokee 4.7L V8 (Manual Transmission)

The Jeep Durability Standard

Engineered for the rigorous demands of WJ owners, this intake system enhances the low-end grunt required for towing and trail running. Designed strictly for off-road applications, it ensures your PowerTech V8 breathes freely and reliably under heavy, off-pavement stress.