Free shipping on orders over $250
2007–2018 Jeep Wrangler JK 3.6L / 3.8L
817942
Overview:
The Flowmaster American Thunder Axle-Back Exhaust System is engineered specifically for Jeep Wrangler JK models from 2007 through 2018 equipped with 3.6L or 3.8L engines. Designed for off-road enthusiasts and performance seekers alike, this axle-back system replaces the factory transverse muffler to deliver improved ground clearance and a moderate, aggressive exhaust tone. Its streamlined design enhances vehicle performance while maintaining a refined sound that complements the rugged character of the Jeep Wrangler.
This system is ideal for drivers who want to upgrade their exhaust without sacrificing daily drivability or requiring extensive modifications. It fits both 2-door and 4-door Wrangler JK models, offering a direct bolt-on installation that can be completed in about 15 minutes.
Key Features:
The Flowmaster American Thunder Axle-Back Exhaust System combines durable materials and precision engineering to provide a reliable and performance-oriented upgrade. Key features include:
Construction & Design:
This exhaust system is crafted from premium 409 stainless steel, known for its excellent resistance to rust and corrosion, ensuring durability in harsh environments. The mandrel-bent tubing maintains consistent diameter throughout bends, promoting smooth exhaust flow and minimizing restrictions. The polished 304 stainless steel tip adds a refined aesthetic touch while resisting discoloration from heat and elements.
The design eliminates the factory transverse muffler, which not only reduces weight but also tucks the tailpipe higher for enhanced ground clearance—an important consideration for off-road driving. The system’s fitment is engineered for a precise, direct bolt-on installation without the need for cutting or welding.
Performance & Sound
By replacing the restrictive factory muffler, the American Thunder Axle-Back system improves exhaust flow, which can contribute to better throttle response and a slight performance gain. The exhaust note is tuned to deliver a moderate, aggressive growl that enhances the Jeep’s presence without being overpowering or drone-prone during highway cruising. This balance makes it suitable for both spirited driving and daily use.
Installation & Fitment:
The Flowmaster American Thunder Axle-Back Exhaust System is designed for a hassle-free installation that most enthusiasts can complete at home in approximately 15 minutes. It fits all 2007–2018 Jeep Wrangler JK models equipped with 3.6L or 3.8L engines, including both 2-door and 4-door variants.
Because the system positions the tailpipe higher than stock, it is generally recommended to pair it with an aftermarket metal bumper to ensure proper clearance and protection during off-road use. The kit includes all necessary mounting hardware, allowing for a straightforward bolt-on process with no modifications required.
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 without compromising ground clearance or daily drivability. It suits off-road enthusiasts seeking a durable, high-clearance exhaust setup as well as street drivers who appreciate a refined yet aggressive exhaust tone. The quick installation and direct fitment make it an excellent choice for DIY installers and those looking to upgrade their Jeep’s exhaust system efficiently.
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.
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PART # 817942
817942 Flowmaster 07-18 Jeep Wrangler JK American Thunder Axle-Back Exhaust System. Designed for Jeep Wrangler JK models from 2007 to 2018 with 3.6L or 3.8L engines, this axle-back exhaust system delivers improved performance and ground clearance. Featuring mandrel-bent 409 stainless steel construction and a polished 304 stainless steel tip, it offers durability and corrosion resistance. The system replaces the factory muffler, reducing weight and providing a moderate, aggressive sound. Easy to install with included hardware, it fits both 2 and 4-door models and comes with a Lifetime Limited Warranty.
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2007–2018 Jeep Wrangler JK 3.6L / 3.8L
817942
Overview:
The Flowmaster American Thunder Axle-Back Exhaust System is engineered specifically for Jeep Wrangler JK models from 2007 through 2018 equipped with 3.6L or 3.8L engines. Designed for off-road enthusiasts and performance seekers alike, this axle-back system replaces the factory transverse muffler to deliver improved ground clearance and a moderate, aggressive exhaust tone. Its streamlined design enhances vehicle performance while maintaining a refined sound that complements the rugged character of the Jeep Wrangler.
This system is ideal for drivers who want to upgrade their exhaust without sacrificing daily drivability or requiring extensive modifications. It fits both 2-door and 4-door Wrangler JK models, offering a direct bolt-on installation that can be completed in about 15 minutes.
Key Features:
The Flowmaster American Thunder Axle-Back Exhaust System combines durable materials and precision engineering to provide a reliable and performance-oriented upgrade. Key features include:
Construction & Design:
This exhaust system is crafted from premium 409 stainless steel, known for its excellent resistance to rust and corrosion, ensuring durability in harsh environments. The mandrel-bent tubing maintains consistent diameter throughout bends, promoting smooth exhaust flow and minimizing restrictions. The polished 304 stainless steel tip adds a refined aesthetic touch while resisting discoloration from heat and elements.
The design eliminates the factory transverse muffler, which not only reduces weight but also tucks the tailpipe higher for enhanced ground clearance—an important consideration for off-road driving. The system’s fitment is engineered for a precise, direct bolt-on installation without the need for cutting or welding.
Performance & Sound
By replacing the restrictive factory muffler, the American Thunder Axle-Back system improves exhaust flow, which can contribute to better throttle response and a slight performance gain. The exhaust note is tuned to deliver a moderate, aggressive growl that enhances the Jeep’s presence without being overpowering or drone-prone during highway cruising. This balance makes it suitable for both spirited driving and daily use.
Installation & Fitment:
The Flowmaster American Thunder Axle-Back Exhaust System is designed for a hassle-free installation that most enthusiasts can complete at home in approximately 15 minutes. It fits all 2007–2018 Jeep Wrangler JK models equipped with 3.6L or 3.8L engines, including both 2-door and 4-door variants.
Because the system positions the tailpipe higher than stock, it is generally recommended to pair it with an aftermarket metal bumper to ensure proper clearance and protection during off-road use. The kit includes all necessary mounting hardware, allowing for a straightforward bolt-on process with no modifications required.
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 without compromising ground clearance or daily drivability. It suits off-road enthusiasts seeking a durable, high-clearance exhaust setup as well as street drivers who appreciate a refined yet aggressive exhaust tone. The quick installation and direct fitment make it an excellent choice for DIY installers and those looking to upgrade their Jeep’s exhaust system efficiently.
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.
