Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is engineered for the driver who wants a complete dual exhaust upgrade with a moderately aggressive exterior tone and a comfortable, moderate interior tone. Built as a full cat-back package, it replaces the restrictive factory piping from the catalytic converters back, unlocking freer flow and the unmistakable Flowmaster sound while keeping cabin drone in check for daily driving.
At the heart of the system is dual 2.50-inch mandrel-bent stainless steel tubing that feeds into Flowmaster’s exclusive Scavenger Series X-pipe. This X-pipe design maximizes scavenging performance and delivers a deep, unique tone that sets the American Thunder series apart. From there, the tubing flows into a pair of specially selected Super 40 Series performance mufflers (muffler part number 852546), which offer more internal volume than many competing mufflers and easily handle the flow demands of the Hemi engine.
Key Benefits
Every detail is built around performance and a clean, straightforward installation. The mandrel-bent tailpipes are finished with a pair of highly polished 304 stainless steel 4.00-inch tips that exit straight out under the rear valance for an aggressive, purposeful look. Because the system uses the factory hanger locations and includes all necessary parts and hardware, it’s designed for an easy fit you can complete at home with common tools.
- Complete cat-back dual exhaust with an aggressive sound level and moderate interior tone
- Dual 2.50-inch mandrel-bent stainless steel tubing for smooth, unrestricted flow
- Exclusive Scavenger Series X-pipe for maximum scavenging and a deep, distinctive tone
- Pair of Super 40 Series performance mufflers (PN 852546) with generous internal volume
- Highly polished 304 stainless steel 4.00-inch dual tips exiting under the rear valance
- Uses factory hanger locations and includes all hardware for a bolt-in home install
Sound & Performance
The American Thunder series is tuned to strike a balance: a moderately aggressive exterior note that announces your presence, paired with a manageable interior tone that keeps highway cruising civilized. Combined with the Super 40 mufflers and the free-flowing X-pipe, this system is a natural match for Hemi-powered platforms looking to breathe better and sound the part.
Fitment & Warranty
This system is configured for 4WD applications and includes all-wheel-drive models. It is CARB (California) compliant, carrying Emission Code 5, and is backed by Flowmaster’s Lifetime Limited Warranty for long-term peace of mind. Please note the California Proposition 65 warning applies to this product. As with any exhaust upgrade, confirm the correct application for your specific vehicle before ordering to ensure the intended fit and finish.
