Flowmaster American Thunder Exhaust for 2018-2021 Ford Mustang | FLO238991

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Fitment Info

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Details

Flowmaster American Thunder Axle-Back Exhaust | 817859

Product Specifications:

  • Diameter (IN): 3 Inch
  • Exhaust Tip Material: Stainless Steel
  • Exhaust Tip Size (IN): 4 Inch
  • Exhaust Tip Type: Angle-Cut
  • Exhaust Type: Dual
  • Exit Position: Quad Split Rear Exit
  • Includes Exhaust Pipe Muffler Delete: No
  • Includes Exhaust Tip: Yes
  • Includes Hardware: Yes
  • Includes Muffler: Yes
  • Material: Stainless Steel
  • Muffler Brand: Flowmaster
  • Muffler Configuration: Single Inlet, Dual Outlet
  • Muffler Quantity: 2
  • Outlet Type: Quad
  • Sound Level: Aggressive
  • Type: Axle-Back

Fitment Chart:

YearsMakeModelSubmodelLitersCylindersNotes
2021FordMustangGT5.0LV8Dual; Dual Rear Exit; Incl. 3 in. Tubing/60 Series(TM) Mufflers/2 Valve Controllers/Quad 4 in. Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant
2021FordMustangGT Premium5.0LV8Dual; Dual Rear Exit; Incl. 3 in. Tubing/60 Series(TM) Mufflers/2 Valve Controllers/Quad 4 in. Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant
2021FordMustangMach 15.0LV8Dual; Dual Rear Exit; Incl. 3 in. Tubing/60 Series(TM) Mufflers/2 Valve Controllers/Quad 4 in. Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant
2019FordMustangBullitt5.0LV8Dual; Dual Rear Exit; Incl. 3 in. Tubing/60 Series(TM) Mufflers/2 Valve Controllers/Quad 4 in. Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant; Fits Vehicles w/o Factory Active Exhaust Valves
2018-2019FordMustangGT5.0LV8Dual; Dual Rear Exit; Incl. 3 in. Tubing/60 Series(TM) Mufflers/2 Valve Controllers/Quad 4 in. Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant; Fits Vehicles w/o Factory Active Exhaust Valves
2018-2019FordMustangGT Premium5.0LV8Dual; Dual Rear Exit; Incl. 3 in. Tubing/60 Series(TM) Mufflers/2 Valve Controllers/Quad 4 in. Polished Tips; 409 Stainless Steel; 50 State Legal / California Emissions Compliant; Fits Vehicles w/o Factory Active Exhaust Valves

 

 

High Performance Exhaust System

High Performance Ford Mustang Exhaust System

The Flowmaster 817859 American Thunder axle-back exhaust system offers the ultimate driving experience. It provides an exhaust sound that is a smoother and aggressive tone. It is made with quality parts and you only have to pay a small price for years of excellent performance.

Unrestricted Exhaust Flow

Unrestricted Exhaust Flow

The 2.5" 16-gauge tubing is mandrel-bent to allow unrestricted flow of exhaust gases and sound waves. The smooth flow prevents interior resonance for reduced exhaust noise.

Optimized Performance

Optimized Ford Mustang Performance

The Flowmaster 817859 American-Thunder axle-back exhaust system also features a dyno tuning to increase functionality and optimize performance.

Easy No-Drill Installation

Easy No-Drill Installation

Installation is easy with no drilling for most vehicle models. You only need to follow the installation guide and clamp it on with the bolts that come with the package. For the best results, it is advisable to have a professional do it.

Made Strong To Last Long

Made Strong For Your Ford Mustang

The Flowmaster 817859 American Thunder is made with strong and tough steel. It is corrosion and rust-resistant, does not bend or break and if maintained properly, will maintain its shine and strength even after years of use.

Manufacturer's Guarantee of Quality

Manufacturer's Guarantee of Quality

Flowmaster provides a limited lifetime warranty for the stainless steel system and a three-year warranty for the aluminized steel exhaust system. PartCatalog is an authorized distributor and will help you out whenever you need assistance with your warranty.

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Part Numbers

The following part numbers are available in this product line: