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Flowmaster American Thunder Crossmember-Back Exhaust System

1964-1966 Ford Mustang with a V8 engine, 2.5" Aluminized Pipes

Part # 17273 Be the first to write a review
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Delta Flow
This American Thunder® crossmember-back exhaust system is custom designed for the 1964-1966 Ford Mustang and is perfect for the person looking for a complete 2.50-inch dual exhaust system with a moderately aggressive exterior tone, and a moderate interior sound. With easy fit in mind, these 16-gauge aluminized steel systems feature all mandrel-bent tubing, an H-pipe to equalize the exhaust pressures and a pair of specially selected 40 Series Delta Flow performance mufflers for a deep powerful sound. The mandrel-bent 2.50-inch tailpipes tuck up out of the way for maximum clearance and the last few feet is all polished stainless steel for a show car look. Like all Flowmaster® systems, benefits include improved throttle response, power, and mileage. Designed for an easy fit, these systems include all necessary parts, hardware and instructions for an easy installation. The system is covered by our 3-year Limited Warranty. Connects to existing header collector reducer cones or manifold downpipes(not included.) If you prefer a full stainless steel system with a Lifetime Limited Warranty, check out exhaust system #817273. Notes: For non GT and hardtop models.


  • Includes Hangers and Hardware for an Easy Installation
  • Mandrel-bent 16-gauge Aluminized Steel Tubing
  • Extra Long Polished Stainless Steel Tips
  • Super 44 Series Performance Mufflers
  • Over 35+years of Flowmaster Quality
  • Deep Powerful Exhaust Tone
  • H-pipe Crossover Tube
  • Crossmember-back System

About Flowmaster

Flowmaster® is a household name, and for good reason. They've built legendary exhaust systems and mufflers for decades, and now offer performance air intakes, catalytic converters, and headers to give your hot rod performance to match the iconic Flowmaster sound.

Brand Flowmaster
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear
Heat ShieldNo
Inlet Diameter (in)2.5
MaterialAluminized Steel
Muffler Part Number942541
Muffler Quantity2
Muffler Series40 Series Delta Flow
Outlet Diameter (in)2.5
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
System TypeCrossmember-back
Tip Diameter (in)2.5
Tip Quantity2
Tubing Diameter (in)2.5
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number17273

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Does Not fit GT models or convertibles.

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    Some parts are not legal for use in California or other states with similar regulations.