Description
Overview
The Flowmaster American Thunder Exhaust System Kit is built for the Chevrolet and Pontiac enthusiast running a 305 or 350 who wants the classic look of a traditional dual setup paired with the real-world benefits of a Flowmaster cat-back exhaust system. This dual-out configuration channels spent gases through a 3.00-inch mandrel-bent aluminized steel inlet tube that feeds a large-case 80 Series Cross-flow performance muffler, delivering a deep, powerful, and unmistakable tone. If you’ve been searching to shop for exhaust that transforms both sound and street presence, this catback exhaust delivers on all fronts.
Sound & Performance
American Thunder systems are engineered to be heard. Expect a moderate to aggressive exterior tone with a milder, mild-moderate interior note that stays comfortable on the highway. As with every Flowmaster performance exhaust, the design targets improved throttle response, power, and mileage, making this a functional upgrade rather than just a cosmetic one. The car exhaust routes into dual 3.00-inch mandrel-bent tailpipes that exit out the back, finished with dual 3.00-inch polished stainless steel tips for a muscular look to match the muscular sound.
Easy, Complete Installation
This exhaust system uses the factory hanger locations, so it bolts up cleanly without cutting or fabricating new mounts. U-Bolt clamping keeps the connections secure, and the kit includes all necessary parts and hardware for a straightforward installation. Whether you’re upgrading tired factory piping or swapping out another exhaust pipe, the American Thunder kit is designed for an easy fit right out of the box.
Key Highlights
- 3.00-inch mandrel-bent aluminized steel inlet tube for smooth, unrestricted flow
- Large-case 80 Series Cross-flow performance muffler (muffler included) for a deep, powerful sound
- Dual 3.00-inch mandrel-bent tailpipes with dual polished stainless steel tips
- Uses factory hanger locations with U-Bolt clamping for easy, no-cut installation
- Silver pipe finish, 2WD application, CARB (California) compliant
- Backed by Flowmaster’s 3-Year Limited Warranty
Fitment
Designed for Chevrolet and Pontiac models equipped with the 305 or 350 engine and a 2WD driveline. This system is CARB (California) compliant with Emission Code 5, and carries a California Proposition 65 warning. Note that the tail pipe quantity is dual, a heat shield is not included, and this is a kit-only offering. For enthusiasts comparing a Borla exhaust, Corsa exhaust, Magnaflow exhaust, or Walker exhaust, the Flowmaster American Thunder stands apart with its signature Cross-flow muffler technology and a proven balance of tone and performance.
When you want a complete exhaust system that looks the part, sounds the part, and delivers measurable performance gains, the Flowmaster American Thunder cat-back is the confident choice for your 305 or 350 build.
