Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is engineered for the driver who wants an aggressive exterior tone paired with a moderate interior sound that won’t drive you out of the cab during a conversation. Built from heavy 16-gauge mandrel-bent aluminized steel tubing, this cat-back system is designed for long-term durability and maximum performance, delivering the deep, purposeful voice the American Thunder series is known for.
At the heart of the system is the aluminized steel Flowmaster 70 Series Big Block II performance muffler (part number 530702). This muffler is tuned for that perfect blend of a deep, aggressive sound on the outside and a moderate, livable tone on the inside, so your truck sounds serious without the constant drone in the cabin.
Key Benefits
Mandrel-bent tubing helps maintain smooth, consistent flow through the exhaust path, while the aluminized steel construction stands up to the demands of daily driving and towing. The dual 2.50-inch tailpipes are designed to clear the factory spare tire and give you two exit options: straight out the back for a true dual look, or exiting out each side behind the rear wheels, which is ideal for towing. The system is finished with a pair of highly polished 3.00-inch 304 stainless steel tips embossed with the Flowmaster name for a clean, unmistakable look.
- Heavy 16-gauge mandrel-bent aluminized steel tubing for durability and performance
- Includes the aluminized steel 70 Series Big Block II performance muffler (P/N 530702)
- Dual 2.50-inch tailpipes that clear the factory spare tire
- Two exit configurations: straight out the back or side exit behind the rear wheels
- Highly polished 3.00-inch 304 stainless steel tips embossed with the Flowmaster name
- U-bolt clamping with all necessary parts, hardware and instructions included
Sound Profile
The 70 Series Big Block II muffler was chosen specifically to produce an aggressive exterior tone with a moderate interior tone. That means you get plenty of attitude at the tailpipe while keeping the interior comfortable enough to hold a conversation or make a call on the road.
Fitment & Installation
This system fits 2WD and 4WD models with an extended cab and short bed configuration. It’s designed for an easy fit and includes all necessary parts, hardware and instructions for a straightforward installation you can complete at home. The system is CARB (California) compliant and carries an Emission Code of 5. California residents please note the Proposition 65 warning.
Backed by Flowmaster’s 3-year Limited Warranty. If you prefer full stainless steel construction with a Lifetime Limited Warranty, consider part number 817470.
