Flowmaster; American Thunder; 1967-70 Mustang V8; Crossmember-Back Stainless Steel Exhaust System; For No Valance Cut-Outs

For the person who is looking for a complete Header-Back dual exhaust system with an aggressive tone. With easy fit in mind, this system is mandrel bent for maximum performance and include specially selected mufflers.

American Thunder systems deliver a moderate to aggressive interior and exterior tone and are suited to the enthusiast who wants their performance to be heard. Like all Flowmaster systems, the benefits include improved throttle response, power and mileage.

• Dyno Tuned For Maximum Performance
• Includes Hangers and Hardware For Easy Installation
• Aggressive Sound Exterior Exhaust Tone
• Mandrel Bent 16 Gauge 409 Stainless Steel Tubing

Made in USA

• H-Pipe Assembly
• Adapter Pipes
• Left Hand Super 44 Series Muffler
• Right Hand Super 44 Series Muffler
• Left Hand Tail Pipe with Stainless Steel Tip
• Right Hand Tail Pipe with Stainless Steel Tip
• Installation Hardware

Important: Not for use on pollution controlled vehicles. See Emission Notes below.

Note: Shipped double oversize.

• 1967-70 Ford Mustang exits through factory valance cut outs

Application Notes: Does not fit convertibles or models with staggered shocks.

This part is legal for sale and use on (PPCV) Pre-Pollution Controlled Vehicles and Racing Use Only Vehicles.


The following vehicles are considered (PPCV) Pre-Pollution Controlled Vehicles:
• 1965 and older U.S. manufactured California Certified vehicles
• 1967 and older U.S. manufactured Federally Certified vehicles
The following vehicles are considered Racing Use Only Vehicles:
• Racing Use Only Vehicles are vehicles that are used exclusively for competition and that are not registered and that may never be used on the street

It is against the law to install this part on an Emissions Controlled Vehicle

The following vehicles are considered Emissions Controlled Vehicles:
• 1966 and newer U.S. manufactured California Certified vehicles
• 1968 and newer U.S. manufactured Federally Certified vehicles