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2015-20 Ford Mustang 2.3L, 3.7L - American Thunder Axle-back Exhaust 817748YouTube Button

Flowmaster American Thunder Axle-back Exhaust System

2015-2020 Ford Mustang with 2.3L Ecoboost and 3.7L engines. Fits Coupes and Convertibles.

PART# 817748

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$585.00   Suggested Retail
$525.95   Holleydays Price
Estimated shipping date: 01/15/2021
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Aggressive to moderate sound


Flowmaster's American Thunder Axle-back exhaust system for the 2015-2020 Ford Mustang with the 2.3L Ecoboost and 3.7L engines is perfect for the person looking for a moderately aggressive sound level outside of the car while maintaining a mild sound level inside. This bolt-on emissions-legal system for cars features 3.00-inch mandrel-bent inlet pipes flowing into a pair of Super 10 Series mufflers for maximum performance. The system is constructed out of 409S stainless steel for durability, is finished off with large 4.00-inch polished stainless steel tips and is covered by our Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation. Note: The sound level of this system is quieted by the factory resonators. Check out our Resonator Delete kit part 81107 and 81108, if you desire more sound from your Ecoboost or 3.7L engine.


  • Large 4.00-inch Polished Stainless Steel Tips
  • 16-gauge Mandrel-bent 3.00-inch Tubing
  • Dyno Tuned For Maximum Performance
  • Super 10 Series Performance Mufflers
  • Uses the Factory Hanger Locations
  • Stainless Steel Construction
  • Lifetime Limited Warranty
  • Flowmaster Quality


Catalytic Converter IncludedNo
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear
Heat ShieldNo
Inlet Diameter (in)3
Material409 Stainless Steel
Mount TypeFlanged
Muffler Part NumberKit Only
Muffler Quantity2
Muffler SeriesSuper 10 Series
Muffler TypeWelded Baffle
Outlet Diameter (in)3
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
System TypeAxle-back
Tip CutAngle
Tip Diameter (in)4
Tip Edge StyleCut
Tip FinishPolished
Tip Length (in)5.25
Tip LogoEmbossed
Tip MaterialStainless Steel
Tip Quantity2
Tip ShapeRound
Tubing Diameter (in)3
Tubing MaterialStainless Steel
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817748



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.

Tech Resources

Fits 2015-2020 Ford Mustang with 2.3L Ecoboost and 3.7L engines. Fits Coupes and Convertibles.


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

         X  Holleydays 2020 20% off and DD
         X  Holleydays 2020 20% off and DD