Transform the sound and performance of your 2025–2026 RAM 1500 3.0L Standard Output and High Output with the Flowmaster American Thunder Cat-Back Exhaust System. Designed as a true performance upgrade, this system enhances exhaust flow, deepens the exhaust tone, and delivers real horsepower gains.

Constructed from 409 stainless steel, the American Thunder system offers long-lasting durability and improved efficiency. Dual 3.00-inch mandrel-bent inlet pipes feed into a custom-tuned American Thunder muffler, engineered to produce a deep, aggressive-to-moderate performance sound. The included Scavenger X-Pipe with D-Port technology maximizes exhaust pulse velocity for noticeable improvements in throttle response and power.

This cat-back system is equipped with dual 3.00-inch tailpipes exiting through the factory bumper cutouts and finished with premium 4.5-inch black ceramic coated stainless steel tips. Tuned resonators in each tailpipe provide a refined cabin sound without sacrificing performance.

On Standard Output models, this system converts the factory exhaust to a true dual configuration, similar to the High Output and RHO models. This ensures improved performance potential and better compatibility with future engine modifications. Dyno testing shows gains of up to 35 horsepower and 33 lb-ft of torque at the wheels on High Output engines.

Installation uses factory hanger locations, includes hardware and instructions, and is backed by Flowmaster’s Lifetime Limited Warranty.

Key Features

• True dual cat-back system for maximum performance
• Dual 3.00-inch mandrel-bent 409 stainless steel tubing
• Scavenger X-Pipe with D-Port technology
• Deep, aggressive-to-moderate American Thunder exhaust tone
• Converts Standard Output models to true dual configuration
• Dyno gains up to 35 hp and 33 lb-ft (HO models)
• 4.5-inch black ceramic coated stainless steel tips
• Tuned resonators for refined cabin acoustics
• Uses factory hanger locations for easy installation
• Includes hardware and mounting components
• Lifetime Limited Warranty

Specifications

• Brand: Flowmaster
• Catalytic Converter Included: No
• Category: Exhaust
• Clamps Included: Yes
• Clamping Type: Flat Band
• Emission Code: 5
• Exhaust Series: American Thunder
• Exhaust Tip Color: Black
• Exhaust Tip Finish: Black Ceramic Coating
• Exhaust Tip Material: 304 Stainless Steel
• Exhaust Tip Diameter: 4.50 in
• Exhaust Tip Length: 11.00 in
• Exhaust Tip Quantity: 2
• Exhaust Tip Shape: Round, Single Wall, Rolled Edge
• Exit Style: Dual Rear Exit
• Finish: Natural
• Gasket/Seal Included: No
• Grade Type: Performance
• Hangers Included: Yes
• Inlet Diameter: 3.00 in
• Main Piping Diameter: 3.00 in
• Pipe Material: 409 Stainless Steel
• Muffler Included: Yes
• Muffler Type: Chambered
• Muffler Finish: Black High-Temperature Paint
• Muffler Body Height: 5.00 in
• Muffler Body Length: 13.50 in
• Muffler Body Width: 10.00 in
• Resonator Body Height (Left/Right): 6.10 in
• Resonator Body Length (Left/Right): 8.25 in
• Resonator Body Width (Left/Right): 6.10 in
• Sound Level: Aggressive / Moderate
• Tailpipe Outlet Diameter: 3.00 in
• Tailpipe Quantity: 2
• Type: Cat-Back
• Valve Included: No

Fitment 

Compatible Vehicles:
• 2025 RAM 1500 3.0L Standard Output
• 2025 RAM 1500 3.0L High Output
• 2026 RAM 1500 3.0L Standard Output
• 2026 RAM 1500 3.0L High Output

Additional Fitment Notes:
• Fits both 2WD and 4WD models
• Uses factory hanger locations
• Converts Standard Output models to a true dual exhaust layout