Description
Overview
The Flowmaster American Thunder Cat-back Exhaust System is built for the enthusiast who wants the aggressive look and sound of a NASCAR race truck combined with all the flow-driven benefits of a genuine Flowmaster cat-back setup. Engineered as a D.O.S.S. (Dual Out Same Side) system, it delivers a moderate to aggressive tone inside and out, making it the perfect choice for drivers who want their performance to be heard.
At the heart of the system is a Super 40 Series performance muffler, tuned to produce the deep, powerful sound Flowmaster is known for. Air moves through 3.00-inch mandrel-bent aluminized steel tubing that maintains smooth, unrestricted flow from the cat-back connection all the way to the rear of the truck, where the exhaust exits through dual 2.50-inch tailpipes capped with a pair of 3.00-inch polished stainless steel tips.
Key Benefits
This American Thunder system is designed to upgrade both the acoustic character and the visual presence of your truck. The aggressive exhaust note announces your presence, while the mandrel-bent tubing and Super 40 Series muffler work together to deliver the free-flowing performance sound that defines the Flowmaster name. The polished stainless tips add a clean, finished look at the rear of the vehicle.
- Complete cat-back system with a Super 40 Series muffler included
- 3.00-inch mandrel-bent aluminized steel tubing for smooth, consistent flow
- Dual 2.50-inch tailpipes in a D.O.S.S. (Dual Out Same Side) configuration
- Pair of 3.00-inch polished stainless steel tips for an aggressive finished look
- U-Bolt clamping style with all necessary hardware and instructions included
- Aggressive interior and exterior sound level
- CARB (California) compliant
- Covered by a 3-Year Limited Warranty
Options & Construction
This configuration is built from aluminized steel tubing and backed by a 3-Year Limited Warranty. For drivers who prefer full stainless steel construction and a Lifetime Limited Warranty, Flowmaster also offers part# 817395 as an alternative. Choose the version that best fits your budget and long-term ownership plans.
Fitment
This American Thunder cat-back system fits both 2-wheel drive and 4-wheel drive models equipped with an extended cab / short bed configuration on a 143.5-inch wheelbase. Everything needed for installation, including the U-Bolt hardware and detailed instructions, is included in the kit. Please note this product carries a California Proposition 65 warning.
If you’re looking to transform the tone and rear-end appearance of your truck with a proven, performance-oriented exhaust, the Flowmaster American Thunder delivers race-inspired sound with the flow benefits of a true cat-back system.
