Description
Overview
The Flowmaster American Thunder Crossmember-Back Exhaust System is custom designed for the 1964-1966 Ford Mustang, giving classic pony car owners a complete 2.50-inch dual exhaust upgrade engineered for an easy fit. Built for the driver who wants a moderately aggressive exterior tone paired with a moderate interior sound, this system replaces tired factory-style plumbing with a purpose-built kit that looks as good as it sounds.
Every American Thunder system is constructed from 16-gauge aluminized steel and features all mandrel-bent tubing to preserve smooth, unrestricted flow. An H-pipe equalizes exhaust pressures side to side, while a matched pair of Flowmaster 40 Series Delta Flow performance mufflers (muffler part number 942541) delivers the deep, powerful signature Flowmaster tone. The result is a system built for real performance benefits: improved throttle response, power, and mileage.
Key Benefits
The mandrel-bent 2.50-inch tailpipes are routed to tuck up out of the way for maximum ground clearance, and the last few feet are finished in polished stainless steel for a show-car look under your Mustang. With a silver pipe finish, dual tailpipe layout, and U-bolt clamping, this crossmember-back kit brings a purposeful, factory-plus-attitude appearance to the rear of the car.
- Type: Crossmember-back dual exhaust, 2.50-inch inlet diameter
- 16-gauge aluminized steel construction with all mandrel-bent tubing
- H-pipe design to equalize exhaust pressures
- Pair of 40 Series Delta Flow mufflers (P/N 942541) for a deep, powerful sound
- Polished stainless steel tailpipe tips for a show-car finish
- U-bolt clamping and CARB (California) compliant, Emission Code 5
Installation & What’s Included
Designed with easy fit in mind, the system includes all necessary parts, hardware, and instructions for a straightforward installation. Mufflers are included, while a heat shield is not. The exhaust connects to existing header collector reducer cones or manifold downpipes, which are not included. The system is covered by a 3-Year Limited Warranty.
Fitment
This American Thunder Crossmember-Back system fits 1964-1966 Ford Mustang 2WD applications and is intended for non-GT and hardtop models. If you prefer a full stainless steel system with a Lifetime Limited Warranty, consider exhaust system #817273. Please note this product carries a California Proposition 65 warning.
For classic Mustang enthusiasts chasing a deeper exhaust note, better throttle response, and a clean, polished appearance out back, the Flowmaster American Thunder system brings proven Delta Flow muffler technology and mandrel-bent flow together in one complete, bolt-together package.
