Description
Overview
The Flowmaster American Thunder Cat-Back Exhaust System is a complete, performance-engineered upgrade built for owners of the 2014-2024 RAM 3500 Crew Cab and Mega Cab equipped with the 6.4L Hemi engine. Constructed from 16-gauge mandrel-bent 409 stainless steel tubing, this American Thunder system is designed to free up airflow, deliver improved performance and fuel economy, and give your RAM 3500 a deep, purposeful presence both inside and outside the cab.
At the heart of the system is the proven 50 Series HD muffler, a black 24.00-inch straight-through design with an offset inlet and dual outlets. Paired with the 3.50-inch inlet pipe and dual 3.00-inch mandrel-bent tailpipes, it produces a deep, moderate performance tone — aggressive enough to announce your truck, refined enough to keep highway and towing miles comfortable.
Key Benefits
Flowmaster engineered this cat-back to bolt on using the factory hanger locations, making installation straightforward with all necessary hardware and easy-to-follow instructions included. The system is finished with a pair of large 4.00-inch polished 304 stainless steel tips featuring an embossed logo, giving your RAM a clean, finished look to match its stronger sound.
- 16-gauge mandrel-bent 409 stainless steel construction for durability and flow
- 50 Series HD muffler (24.00-inch, black) tuned for a deep, moderate tone
- 3.50-inch inlet pipe feeding dual 3.00-inch mandrel-bent tailpipes
- Large 4.00-inch polished 304 stainless steel tips with embossed logo
- Mounts to factory hangers — no fabrication required
- CARB (California) compliant with a Lifetime Limited Warranty
Two Exit Configurations
Versatility is built in: the kit ships with two sets of tailpipe exits so you can route the exhaust to suit how you use your truck. Choose the straight-out-the-back exit that clears under the bumper, or opt for the side exits that route out behind the rear wheels — an ideal setup for towing applications where you want to keep the exhaust away from trailers and cargo areas.
Fitment
This American Thunder cat-back is designed specifically for the 2014-2024 RAM 3500 Crew Cab and Mega Cab with the 6.4L Hemi. It fits both 2- and 4-wheel-drive trucks with single or dual rear wheels, and covers 149.5, 160, and 168.9-inch wheelbases. The dual tailpipe layout and factory-hanger mounting make it a natural, direct-fit upgrade.
Backed by a Lifetime Limited Warranty and CARB-compliant for emissions-legal use, the Flowmaster American Thunder system delivers a serious blend of sound, performance, and bolt-on convenience for your heavy-duty RAM.
Warning: California Proposition 65.
