Description
Overview
The Flowmaster American Thunder Crossmember-Back Exhaust System brings classic muscle-car attitude and modern flow to your early Ford Mustang. Engineered specifically for 1964-1966 Ford Mustang hardtop coupes equipped with a V8 engine, this complete crossmember-back kit replaces the restrictive factory exhaust with a free-flowing, great-sounding setup that looks as good as it performs. Every component is designed to work together, so you get a cohesive system rather than a collection of mismatched parts.
At the heart of the system is a free-flowing 2.50-inch mandrel-bent stainless steel H-pipe that feeds into a pair of 40 Series Delta Flow mufflers. This pairing is built to deliver maximum power while producing that deep, iconic Flowmaster tone. With an aggressive-to-moderate sound level, the American Thunder series gives your Mustang a purposeful growl at throttle without droning through your daily drives.
Key Benefits
Mandrel-bent 2.50-inch tailpipes tuck up high for improved ground clearance and a clean underbody appearance, while a pair of long 2.50-inch 304 stainless steel tips finish the system off with true show-car style. The dual tailpipe layout delivers balanced flow and the aggressive stance you want from a classic V8 Mustang. Because it’s a 2WD, crossmember-back configuration, the kit covers the exhaust from the crossmember to the tips in one coordinated package.
- Free-flowing 2.50-inch mandrel-bent stainless steel H-pipe for smooth, efficient exhaust flow
- Dual 40 Series Delta Flow mufflers tuned for a deep, aggressive-to-moderate Flowmaster sound
- 2.50-inch mandrel-bent stainless tailpipes that tuck up high for clearance and clean looks
- Long 2.50-inch 304 stainless steel exhaust tips for a finished, show-car appearance
- Mufflers included, plus all necessary parts and hardware
- CARB (California) compliant with Emission Code 5
Complete Kit
This American Thunder system is a complete bolt-on kit that includes all necessary parts, hardware, and easy-to-follow instructions, making installation straightforward for a project you can tackle in the garage. The mufflers are included as part of the kit, and it is covered by Flowmaster’s Lifetime Limited Warranty for lasting peace of mind. Note that a heat shield is not included with this system.
Fitment
Designed for all 1964-1966 Ford Mustang hardtop coupes with a V8 engine and a 2WD drivetrain. Please note this crossmember-back system does not fit GT models or convertibles. This product carries a California Proposition 65 warning. Choose the American Thunder crossmember-back exhaust to restore the sound, style, and flow your classic Mustang deserves.
