Kooks Headers Stainless Steel Catted Y-Pipe

2007–2018 Jeep Wrangler & 2005–2010 Jeep Grand Cherokee LS Swap

37103200

Overview:

The Kooks Stainless Steel 3-inch Catted Y-Pipe is engineered specifically for LS engine swaps in Jeep Wrangler models from 2007 to 2018 and Jeep Grand Cherokee models from 2005 to 2010. Designed to be used in conjunction with Kooks headers, this Y-pipe provides a seamless connection between the exhaust headers and the cat-back system, ensuring optimal exhaust flow and performance. Ideal for enthusiasts upgrading their Jeep with an LS engine, this component enhances power delivery while maintaining emissions compliance through high-flow catalytic converters.

Handcrafted in the USA by Kooks Headers and Exhaust, a leader in high-performance exhaust systems for over 50 years, this Y-pipe is built to meet the demands of street, race, and off-road applications. It is a critical component for anyone looking to maximize the potential of their LS swap with reliable, race-proven hardware.

Key Features:

Designed with precision and durability in mind, the Kooks Stainless Steel Catted Y-Pipe offers the following key features:

• Constructed from premium 304 stainless steel for superior corrosion resistance and longevity
• 3-inch mandrel-bent 16-gauge tubing for smooth exhaust flow and minimal restriction
• Equipped with Kooks 300 cell standard race high-flow catalytic converters for improved emissions control without sacrificing performance
• Torca swivel seal style connection on the inlet for secure, leak-free fitment
• Designed exclusively for use with Kooks headers (Part #37102200 or #37102400) and compatible with Kooks cat-back exhaust systems (Part #37104100)
• Optimized for LS engine swaps using RPM Extreme or similar LS swap kits
• Backed by Kooks’ limited lifetime warranty to the original purchaser
• Dyno and race tested to ensure maximum power output and durability

Construction & Design:

The Y-pipe is expertly handcrafted in the USA using aircraft-quality T304 stainless steel, known for its exceptional strength and resistance to rust and corrosion. The 3-inch mandrel-bent tubing maintains consistent diameter throughout bends, preventing flow restrictions and turbulence that can reduce engine efficiency. The integrated high-flow catalytic converters utilize a 300 cell design, balancing emissions compliance with performance gains. The Torca swivel seal connection ensures a tight, vibration-resistant joint, simplifying installation and enhancing durability under demanding conditions.

Performance & Sound

By optimizing exhaust flow from the LS engine headers through to the cat-back system, this Y-pipe contributes to improved horsepower and torque delivery. The high-flow catalytic converters maintain emissions standards while minimizing backpressure, resulting in a more responsive throttle and enhanced engine sound. This setup is ideal for drivers seeking a balance between street-legal operation and aggressive performance tone.

Installation & Fitment:

This Y-pipe is designed for Jeep Wrangler JK 4-door models from 2007 to 2018 and Jeep Grand Cherokee models from 2005 to 2010 equipped with LS engine swaps. Installation requires the use of Kooks headers and is compatible with RPM Extreme or similar LS swap kits. For proper fitment, the RPM Extreme engine mount plate (Part #JKLS-HC-ENG-MOUNT) or equivalent and GM Gen 4 style hydraulic engine mounts are necessary. Two-door Jeep Wrangler models may require fuel tank relocation, and a minimum 2-1/2 inch suspension lift is recommended to accommodate the exhaust system. Due to the custom nature of LS swaps, additional modifications or parts may be required; consulting Kooks Headers and Exhaust prior to purchase is advised.

What's Included:

• 3-inch stainless steel catted Y-pipe with integrated high-flow catalytic converters
• Torca swivel seal style inlet connection
• Installation hardware as required

Ideal For:

This Y-pipe is perfect for Jeep enthusiasts performing LS engine swaps who demand a high-quality, durable exhaust component that supports both performance and emissions compliance. It suits street drivers, off-road adventurers, and racers who rely on proven, handcrafted American-made parts to maximize their vehicle’s potential.

Kooks Headers & Exhaust is a heritage performance exhaust manufacturer best known for high-quality stainless steel headers and complete exhaust systems. Built for serious street and track builds, Kooks products focus on fitment, durability, and the kind of airflow improvements enthusiasts chase when stepping up power.