Flowmaster American Thunder Direct Fit Muffler

2025–2026 Ram 1500 3.0L High Output

818204

Overview:

The Flowmaster American Thunder Direct Fit Muffler is engineered specifically for the 2025 and 2026 Ram 1500 equipped with the 3.0-liter High Output engine. Designed to deliver a perfect balance of aggressive sound and enhanced performance, this muffler system allows Ram owners to personalize their truck’s exhaust note without compromising reliability or fitment. Ideal for enthusiasts seeking a straightforward upgrade, it offers a direct bolt-on installation that maintains factory mounting points and connections.

Whether you drive a 2-wheel or 4-wheel drive model, this muffler provides a durable and effective solution to improve exhaust flow and add a distinctive tone that complements the Ram 1500’s powerful engine.

Key Features:

Flowmaster’s American Thunder Direct Fit Muffler combines quality materials and proven design to enhance your truck’s performance and sound. Key features include:

• Precision fit for 2025–2026 Ram 1500 with 3.0L High Output engine
• Constructed from corrosion-resistant 409 stainless steel for long-lasting durability
• 3.00-inch inlet pipe feeding into a Super 10 based muffler for optimal exhaust flow
• Dual exit muffler design that connects seamlessly to factory tailpipes
• Max dyno gains of 13 horsepower and 12 lb-ft torque at the rear wheels
• Utilizes all factory hanger locations and connections for easy installation
• Includes complete installation instructions and necessary hardware
• Backed by Flowmaster’s Lifetime Limited Warranty for peace of mind

Construction & Design:

The American Thunder Direct Fit Muffler is crafted from premium 409 stainless steel, chosen for its excellent resistance to rust and corrosion, ensuring years of dependable service even under harsh driving conditions. The Super 10 muffler core is a signature Flowmaster design that balances sound attenuation with performance gains, providing a deep, aggressive exhaust tone without excessive drone.

The 3.00-inch inlet pipe is engineered to optimize exhaust flow, reducing backpressure and enhancing engine efficiency. The dual exit design not only improves exhaust scavenging but also complements the Ram 1500’s muscular styling with a clean, factory-integrated appearance.

Performance & Sound

Flowmaster’s American Thunder muffler system delivers measurable performance improvements, with dyno-tested gains of up to 13 horsepower and 12 lb-ft of torque at the rear wheels. This translates to a noticeable increase in throttle response and overall power delivery. The exhaust note is distinctly aggressive yet refined, providing a commanding presence on the road without overwhelming cabin noise.

Installation & Fitment:

This direct fit muffler is designed for a hassle-free installation that retains all factory hanger locations and connections. No cutting, welding, or modifications are required, making it an ideal upgrade for DIY enthusiasts or professional installers. The kit includes detailed instructions and all necessary hardware to ensure a secure and proper fit on both 2-wheel and 4-wheel drive Ram 1500 models from 2025 to 2026.

What's Included:

• Flowmaster American Thunder Direct Fit Muffler
• Installation hardware
• Detailed installation instructions

Ideal For:

This muffler is perfect for Ram 1500 owners who want to enhance their truck’s performance and sound without compromising factory fitment or reliability. It suits drivers looking for a durable, bolt-on exhaust upgrade that delivers both power gains and a bold exhaust tone, whether for daily driving, towing, or weekend adventures.

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.