Kooks Headers Longtube Headers & OEM Catted Mid Pipes

2011–2023 Dodge Durango / 2011–2023 Jeep Grand Cherokee 5.7L VVT HEMI

Part #: 3610H421

Overview

The Kooks Headers 1.875" Longtube Headers & OEM Catted Mid Pipes kit is a premium exhaust upgrade designed specifically for the 2011 through 2023 Dodge Durango and Jeep Grand Cherokee equipped with the 5.7L VVT HEMI engine. This complete header and connection pipe system replaces the factory exhaust manifolds and mid pipes with high-flow long tube headers and integrated catalytic converters, enhancing exhaust flow and engine efficiency.

Engineered for enthusiasts seeking improved throttle response, increased horsepower, and a more aggressive exhaust tone, this kit offers a direct bolt-on solution that maintains emissions compliance. Whether for spirited street driving, off-road performance, or track use, Kooks delivers a durable, race-proven exhaust upgrade handcrafted in the USA.

Key Features

This Kooks header and connection kit combines precision engineering with quality materials to deliver reliable performance gains and long-term durability:

• 1-7/8 inch primary tube diameter paired with 3 inch collectors for optimized exhaust scavenging and flow
• Includes stainless steel long tube headers and OEM-style 3 inch stainless catted connection pipes
• Constructed from premium T304 aircraft-quality stainless steel for superior corrosion resistance and strength
• Handcrafted in the USA with meticulous attention to weld quality and fitment
• Dyno and race tested to ensure maximum power output and reliability under demanding conditions
• Direct bolt-on fitment for 2011–2023 Dodge Durango and Jeep Grand Cherokee models, including the Grand Cherokee L (2021–2022)
• Integrated catalytic converters maintain factory-like emissions compliance without sacrificing performance
• Limited lifetime warranty to the original purchaser for peace of mind

Construction & Design

Kooks utilizes T304 stainless steel, renowned for its exceptional durability, heat resistance, and corrosion protection, ensuring these headers withstand the rigors of daily driving and high-performance use. Each header is handcrafted in the USA by skilled technicians, guaranteeing precise welds and consistent quality control.

The 1-7/8 inch primary tubes are engineered to optimize exhaust gas scavenging, improving engine breathing and efficiency. The 3 inch collectors and OEM-style catted connection pipes maintain smooth exhaust flow while integrating catalytic converters to meet emissions standards. This thoughtful design balances performance gains with environmental responsibility.

Performance & Sound

Replacing the restrictive factory manifolds with long tube headers significantly reduces exhaust backpressure, resulting in improved horsepower and torque, particularly in the mid to high RPM range. Drivers will notice enhanced throttle response and a deeper, more aggressive exhaust note that enriches the driving experience without excessive drone or harshness.

The integrated catalytic converters ensure that these performance improvements do not compromise emissions compliance, making this kit suitable for street-driven vehicles as well as off-road and racing applications.

Installation & Fitment

This Kooks header and connection kit is designed for direct bolt-on installation on compatible 2011–2023 Dodge Durango and Jeep Grand Cherokee 5.7L HEMI models, including the 2021–2022 Grand Cherokee L. Installation requires standard hand tools and moderate mechanical knowledge, with no major modifications or cutting necessary, preserving the integrity of your vehicle’s exhaust system.

Professional installation is recommended to ensure proper fitment and to maximize performance benefits.

What's Included

• 1-7/8 inch x 3 inch stainless steel long tube headers
• 3 inch stainless steel OEM-style catted connection pipes
• All necessary gaskets and hardware for installation
• Detailed installation instructions

Ideal For

This Kooks header and connection kit is ideal for Dodge Durango and Jeep Grand Cherokee owners who want to upgrade their exhaust system for enhanced power, improved throttle response, and a more aggressive exhaust tone. It suits street performance enthusiasts, off-road adventurers, and racers who demand reliable, high-quality components backed by decades of racing heritage and American craftsmanship.