Flowmaster American Thunder Cat-Back Exhaust System
2025–2026 Ram 1500 3.0L Standard and High Output
818199
Overview:
The Flowmaster American Thunder Cat-Back Exhaust System is engineered specifically for the 2025–2026 Ram 1500 equipped with the 3.0-liter Standard and High Output engines. Designed to enhance both performance and sound, this true dual exhaust system offers Ram owners a way to personalize their truck’s exhaust note while unlocking additional power potential. Whether you drive a 2-wheel or 4-wheel drive model, this system delivers a robust upgrade that complements the Ram 1500’s capabilities and style.
Ideal for enthusiasts looking to improve exhaust flow and add a deep, aggressive tone, the American Thunder Cat-Back system balances performance gains with a refined in-cabin experience. It’s a direct-fit solution that maintains factory mounting points and exhaust routing for a hassle-free installation.
Key Features:
This Flowmaster exhaust system incorporates advanced design elements to maximize performance and sound quality:
- Constructed from durable 409 stainless steel for long-lasting corrosion resistance and strength
- True dual exhaust configuration with dual 3.00-inch inlet pipes for improved exhaust flow
- Custom-tuned American Thunder series muffler engineered for a deep, aggressive exhaust tone
- Exclusive Flowmaster Scavenger X-Pipe featuring D-Port technology to optimize exhaust pulse velocity
- Dual 3.0-inch mandrel-bent tailpipes that exit through factory bumper cutouts for a clean, OEM appearance
- 4.5-inch black ceramic coated exhaust tips for a sleek, aggressive finish
- Tuned resonators integrated into the tailpipe assemblies to reduce drone and maintain cabin comfort
- Compatible with both Standard and High Output 3.0L engines, converting Standard Output models to a true dual exhaust layout
- Utilizes all factory hanger locations and connections for straightforward installation
Construction & Design:
The American Thunder Cat-Back Exhaust System is crafted from premium 409 stainless steel, chosen for its excellent resistance to heat and corrosion, ensuring years of reliable service. The system’s mandrel-bent tubing preserves smooth exhaust flow by eliminating restrictions and sharp bends. Flowmaster’s proprietary Scavenger X-Pipe with D-Port technology enhances exhaust scavenging, which improves engine efficiency and power output. The black ceramic coated tips not only provide a distinctive look but also offer additional protection against the elements.
Performance & Sound
This cat-back system delivers measurable performance improvements, with maximum dyno gains of up to 35 horsepower and 33 lb-ft of torque at the rear wheels on High Output models. The true dual exhaust layout enhances exhaust flow dynamics, supporting better throttle response and overall engine efficiency. The American Thunder muffler produces a deep, aggressive exhaust note that is unmistakably Flowmaster, while the tuned resonators help minimize drone inside the cabin, making it suitable for daily driving as well as spirited performance.
Installation & Fitment:
Designed as a direct bolt-on upgrade for the 2025 and 2026 Ram 1500 3.0L Standard and High Output engines, this cat-back exhaust system installs using all factory hanger locations and connections. No cutting, welding, or modifications are required, allowing for a straightforward installation that can be completed at home with basic tools. The system fits both 2-wheel and 4-wheel drive models and retains the factory bumper cutouts for a seamless, factory-like appearance.
What's Included:
- 409 stainless steel American Thunder series muffler
- Dual 3.00-inch inlet pipes
- Flowmaster Scavenger X-Pipe with D-Port technology
- Dual 3.0-inch mandrel-bent tailpipes
- 4.5-inch black ceramic coated exhaust tips
- Tuned resonators integrated in tailpipe assemblies
- All necessary mounting hardware
- Detailed installation instructions
Ideal For:
This exhaust system is perfect for Ram 1500 owners who want to enhance their truck’s performance and sound without sacrificing comfort or requiring complex installation. It suits enthusiasts seeking a bold, aggressive exhaust tone combined with improved horsepower and torque, as well as those planning future engine modifications who want a true dual exhaust setup. Whether for daily driving or weekend adventures, the Flowmaster American Thunder Cat-Back Exhaust System delivers a balanced upgrade that complements the Ram 1500’s rugged character.
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.
Flowmaster American Thunder Cat-Back Exhaust System: Ram 1500 2025-2026
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PART # 818199
818199 Flowmaster 25-26 Ram 1500 American Thunder Cat-Back Exhaust System. This true dual exhaust system is crafted from durable 409 stainless steel, delivering a deep, aggressive tone and improved performance for 3.0L Standard and High Output engines. Featuring Flowmaster’s exclusive Scavenger X-Pipe with D-Port technology, it maximizes exhaust pulse velocity for up to 35 hp and 33 lb-ft gains. The system includes mandrel-bent pipes, tuned resonators for a comfortable cabin sound, and black ceramic coated tips. Easy to install using factory hangers, it’s backed by a lifetime limited warranty.
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Flowmaster American Thunder Cat-Back Exhaust System
2025–2026 Ram 1500 3.0L Standard and High Output
818199
Overview:
The Flowmaster American Thunder Cat-Back Exhaust System is engineered specifically for the 2025–2026 Ram 1500 equipped with the 3.0-liter Standard and High Output engines. Designed to enhance both performance and sound, this true dual exhaust system offers Ram owners a way to personalize their truck’s exhaust note while unlocking additional power potential. Whether you drive a 2-wheel or 4-wheel drive model, this system delivers a robust upgrade that complements the Ram 1500’s capabilities and style.
Ideal for enthusiasts looking to improve exhaust flow and add a deep, aggressive tone, the American Thunder Cat-Back system balances performance gains with a refined in-cabin experience. It’s a direct-fit solution that maintains factory mounting points and exhaust routing for a hassle-free installation.
Key Features:
This Flowmaster exhaust system incorporates advanced design elements to maximize performance and sound quality:
- Constructed from durable 409 stainless steel for long-lasting corrosion resistance and strength
- True dual exhaust configuration with dual 3.00-inch inlet pipes for improved exhaust flow
- Custom-tuned American Thunder series muffler engineered for a deep, aggressive exhaust tone
- Exclusive Flowmaster Scavenger X-Pipe featuring D-Port technology to optimize exhaust pulse velocity
- Dual 3.0-inch mandrel-bent tailpipes that exit through factory bumper cutouts for a clean, OEM appearance
- 4.5-inch black ceramic coated exhaust tips for a sleek, aggressive finish
- Tuned resonators integrated into the tailpipe assemblies to reduce drone and maintain cabin comfort
- Compatible with both Standard and High Output 3.0L engines, converting Standard Output models to a true dual exhaust layout
- Utilizes all factory hanger locations and connections for straightforward installation
Construction & Design:
The American Thunder Cat-Back Exhaust System is crafted from premium 409 stainless steel, chosen for its excellent resistance to heat and corrosion, ensuring years of reliable service. The system’s mandrel-bent tubing preserves smooth exhaust flow by eliminating restrictions and sharp bends. Flowmaster’s proprietary Scavenger X-Pipe with D-Port technology enhances exhaust scavenging, which improves engine efficiency and power output. The black ceramic coated tips not only provide a distinctive look but also offer additional protection against the elements.
Performance & Sound
This cat-back system delivers measurable performance improvements, with maximum dyno gains of up to 35 horsepower and 33 lb-ft of torque at the rear wheels on High Output models. The true dual exhaust layout enhances exhaust flow dynamics, supporting better throttle response and overall engine efficiency. The American Thunder muffler produces a deep, aggressive exhaust note that is unmistakably Flowmaster, while the tuned resonators help minimize drone inside the cabin, making it suitable for daily driving as well as spirited performance.
Installation & Fitment:
Designed as a direct bolt-on upgrade for the 2025 and 2026 Ram 1500 3.0L Standard and High Output engines, this cat-back exhaust system installs using all factory hanger locations and connections. No cutting, welding, or modifications are required, allowing for a straightforward installation that can be completed at home with basic tools. The system fits both 2-wheel and 4-wheel drive models and retains the factory bumper cutouts for a seamless, factory-like appearance.
What's Included:
- 409 stainless steel American Thunder series muffler
- Dual 3.00-inch inlet pipes
- Flowmaster Scavenger X-Pipe with D-Port technology
- Dual 3.0-inch mandrel-bent tailpipes
- 4.5-inch black ceramic coated exhaust tips
- Tuned resonators integrated in tailpipe assemblies
- All necessary mounting hardware
- Detailed installation instructions
Ideal For:
This exhaust system is perfect for Ram 1500 owners who want to enhance their truck’s performance and sound without sacrificing comfort or requiring complex installation. It suits enthusiasts seeking a bold, aggressive exhaust tone combined with improved horsepower and torque, as well as those planning future engine modifications who want a true dual exhaust setup. Whether for daily driving or weekend adventures, the Flowmaster American Thunder Cat-Back Exhaust System delivers a balanced upgrade that complements the Ram 1500’s rugged character.
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.
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Standard shipping
Free Standard Shipping on orders over $250. Select “Free Shipping” at checkout.
Free Easy Returns
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.