Description
Overview
The Flowmaster American Thunder Crossmember-Back Exhaust System is a complete, true dual setup engineered specifically for the 1968-1972 GM A-body running a V8 engine. Designed for the enthusiast who wants real performance they can hear, this American Thunder system replaces your restrictive factory pipes with a fully mandrel-bent, high-flow package that delivers an aggressive tone inside and out while sharpening the way your classic muscle car drives.
At the heart of the kit is 2.50-inch mandrel-bent stainless steel tubing, sized for maximum performance and long-term durability. A built-in H-pipe/balance tube ties both sides together and feeds into a pair of large-case Super 40 Series mufflers, the combination responsible for that unmistakable deep, aggressive American Thunder sound. Dual 2.50-inch tailpipes exit at a slight downward angle beneath the rear bumper, giving your A-body a strong, muscular stance to match the attitude coming out of the pipes.
Key Benefits
Like all Flowmaster systems, the American Thunder Crossmember-Back exhaust is built to do more than just sound great. The free-flowing 2.50-inch tubing and Super 40 mufflers work together to improve throttle response, power, and mileage, making this a true performance upgrade rather than a purely cosmetic one. Everything needed to bolt it in comes in the box, including all hangers and necessary hardware for a straightforward installation.
- Complete true dual crossmember-back system for 1968-1972 GM A-body V8 applications
- 2.50-inch mandrel-bent stainless steel tubing for maximum flow and durability
- Built-in H-pipe/balance tube for balanced exhaust flow and tone
- Pair of large-case Super 40 Series mufflers for an aggressive interior and exterior sound
- Dual 2.50-inch tailpipes exit at a slight down angle under the rear bumper
- Includes all hangers and necessary hardware for installation
- CARB (California) compliant
- Covered by Flowmaster’s Lifetime Limited Warranty
Sound & Fitment
The Super 40 Series mufflers give this system an aggressive sound level that carries from the cabin to the street, making it ideal for owners who want their performance to be heard. The system is engineered for 2WD, V8-powered 1968-1972 GM A-body vehicles, with a 2.50-inch inlet diameter and dual tailpipe layout for balanced, symmetrical exits.
What’s Included
This is the complete exhaust kit with the Super 40 mufflers included. Exhaust tips are sold separately, and a heat shield is not included, so you can finish the look exactly how you want. With CARB compliance and Flowmaster’s Lifetime Limited Warranty behind it, the American Thunder Crossmember-Back system is a proven way to add sound, style, and performance to your classic GM A-body. Please note this product carries a California Proposition 65 warning.
