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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:
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:
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.
Flowmaster is an iconic exhaust brand famous for signature exhaust tone and performance mufflers, as well as complete axle-back and cat-back systems. Built for muscle cars, trucks, and performance builds, Flowmaster systems are designed to improve flow and deliver the sound character enthusiasts chase.
ETA stands for Estimated Time of Arrival. The date shown is calculated using our Available-to-Promise (ATP) system, which tracks real-time supplier commitments to determine when a product is expected to be available for delivery. Specifically, the date is calculated by adding 9 business days from the date a supplier has committed to ship the product, representing a worst-case scenario for when we can expect to receive inventory.
Please note: The ETA is an estimate, not a guarantee. While we work closely with our suppliers to keep dates as accurate as possible, delays due to shipping carriers, weather, customs, or supplier-side issues may occasionally push the actual arrival beyond the date shown. Likewise, inventory may arrive sooner than the ETA in many cases. If you would like to be notified for when this item arrives, sign up for our back in stock notifications!
PART # 817674
817674 Flowmaster 07-18 Jeep Wrangler / Wrangler JK American Thunder Cat-Back Exhaust System. Upgrade your Jeep with this high-clearance cat-back exhaust designed for 2007-2018 Wrangler JK 2-door and 4-door models with 3.8L or 3.6L engines. Crafted from durable 409 stainless steel, it delivers a moderate to aggressive sound while improving off-road ground clearance. The mandrel-bent 2.50-inch tailpipe and polished 3.00-inch tip tuck neatly under the rear bumper. Easy to install with included hardware and backed by a Lifetime Limited Warranty for lasting performance.
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MADE IN THE USA
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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:
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:
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.
Flowmaster is an iconic exhaust brand famous for signature exhaust tone and performance mufflers, as well as complete axle-back and cat-back systems. Built for muscle cars, trucks, and performance builds, Flowmaster systems are designed to improve flow and deliver the sound character enthusiasts chase.
Free Standard Shipping on orders over $250. Select “Free Shipping” at checkout.
Need to return an item? We make it easy. Email us and we'll send you a free return label with instructions on how to return.
Free Standard Shipping on orders over $250. Select “Free Shipping” at checkout.
Need to return an item? We make it easy. Email us and we'll send you a free return label with instructions on how to return.
