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Flowmaster FlowFX Cat-Back Exhaust System

2015-2021 Ford Mustang 2.3L Ecoboost engine, coupes and convertibles.

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Introducing the new FlowFX® Cat-back exhaust system for 2015-2021 Ford Mustang with the 2.3L Ecoboost engine. This system is perfect for the person looking for a deep powerful exterior sound while maintaining a moderate interior sound level with all of the performance benefits that you would expect from Flowmaster®. Features include a single 3.00-inch mandrel-bent stainless steel inlet tube coming off the catalytic converter, flowing into a Scavenger® Series Y-pipe which transitions into dual 3.00-inch exhaust flowing into a pair of FlowFX® "straight-through" performance mufflers for maximum performance and a deep powerful sound. The system utilizes the factory hanger locations for an easy hassle-free installation, and is finished off with a pair of large 4.00-inch carbon fiber tips for a cool modern look. Designed for an easy installation this system includes all necessary parts, hardware, and detailed instructions.


  • FlowFX "Straight-through" Performance Mufflers
  • 16-gauge Mandrel-bent Stainless Steel Tubing
  • Dyno-Tuned for Maximum Performance
  • Includes a Scavenger Series Y-pipe
  • Uses the Factory Hanger Locations
  • Large 4.00-inch Carbon Fiber Tips
  • Includes all Necessary Hardware
  • Lifetime Limited Warranty
  • Quick & Easy Installation
  • Deep Powerful Sound

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 SeriesFlowFX
Exit PositionDual Out Rear
Material409 Stainless Steel
Mount TypeUses Factory Hangers
Muffler SeriesFlowFX
Muffler TypeAbsorption
Product TypeExhaust System
Single DualDual
Sound LevelModerate
System TypeCat-back
Tip Diameter4
Tip Edge StyleRolled
Tip Length5.25
Tip Material304 Stainless/Carbon Fiber
Tip ShapeRound
Tubing Diameter (in)3
Tubing Material409S Stainless Steel
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number717848

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.

Fits 2015-2021 Ford Mustang 2.3L Ecoboost engine, coupes and convertibles.

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