Flowmaster American Thunder Cat-Back Exhaust System: Jeep Wrangler (07-17) / Wrangler JK 2018

Flowmaster American Thunder Cat-Back Exhaust System

2007–2018 Jeep Wrangler JK 3.6L / 3.8L

817674

Overview:

The Flowmaster American Thunder Cat-Back Exhaust System is engineered specifically for Jeep Wrangler JK models from 2007 through 2018 equipped with either the 3.6L or 3.8L engines. Designed for both 2-door and 4-door configurations, this high-clearance exhaust system delivers enhanced performance while maintaining excellent off-road ground clearance. It replaces the factory transverse muffler with a more efficient layout that improves exhaust flow and produces a distinctive moderate to aggressive exhaust tone. Ideal for Jeep enthusiasts seeking a balance of power, sound, and durability, this system is a direct bolt-on upgrade that elevates your Wrangler’s driving experience.

Key Features:

This cat-back exhaust system combines innovative design with premium materials to deliver reliable performance and an aggressive sound profile. Key features include:

• High-clearance design that relocates the Super HP-2 muffler behind the factory catalytic converter for improved off-road capability
• Mandrel-bent 2.50-inch stainless steel tailpipe for optimized exhaust flow and minimal restriction
• 3.00-inch polished stainless steel exhaust tip tucked high under the rear bumper to maximize ground clearance
• Aggressive to moderate exhaust sound that enhances the Jeep’s presence without excessive drone
• Compatible with both 2-door and 4-door Jeep Wrangler JK models (2007–2018) with 3.6L or 3.8L engines
• Includes all necessary hardware and components for straightforward installation
• Covered by Flowmaster’s Lifetime Limited Warranty for long-term peace of mind

Construction & Design:

The Flowmaster American Thunder system is constructed from durable 409 stainless steel, known for its corrosion resistance and strength, ensuring longevity even in harsh off-road environments. The mandrel-bent tubing maintains consistent diameter throughout bends, reducing flow restrictions and enhancing exhaust efficiency. The polished stainless steel tip not only adds a sleek visual touch but is also designed to withstand the elements while maintaining its finish. The system’s layout strategically relocates the muffler to improve ground clearance, a critical factor for off-road enthusiasts who demand rugged capability without sacrificing performance.

Performance & Sound

This cat-back exhaust system is engineered to improve exhaust flow, which can contribute to enhanced throttle response and a more robust engine sound. The American Thunder muffler delivers a distinctive tone that ranges from moderate to aggressive, providing a commanding presence without overwhelming cabin noise. This sound profile is ideal for Jeep owners who want to enjoy a spirited driving experience both on and off the road.

Installation & Fitment:

The Flowmaster American Thunder Cat-Back Exhaust System is designed for a direct bolt-on installation, replacing the factory transverse muffler with minimal modifications required. It fits all 2007–2018 Jeep Wrangler JK models with 3.6L or 3.8L engines, including both 2-door and 4-door variants. Due to the high-mounted tailpipe, it is recommended to use an aftermarket metal rear bumper to ensure proper clearance and protection. Installation can be completed at home with basic hand tools, and all necessary hardware is included.

What's Included:

• Super HP-2 muffler
• Mandrel-bent 2.50-inch stainless steel tailpipe
• 3.00-inch polished stainless steel exhaust tip
• All mounting hardware and clamps
• Installation instructions

Ideal For:

This exhaust system is perfect for Jeep Wrangler JK owners who want to enhance their vehicle’s performance and sound while maintaining excellent off-road ground clearance. It suits enthusiasts who enjoy trail riding, daily driving, and those looking to upgrade their factory exhaust for a more aggressive tone and improved exhaust flow. The high-clearance design makes it especially appealing for off-road adventurers who require durable and functional components that withstand rugged terrain.