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Flowmaster

Flowmaster Outlaw Axle-Back Exhaust System

Part # 818159

Fits 2024-2026 Ford Mustang GT 5.0-liter and EcoBoost 2.3-liter, Outlaw Axle-Back 3.0-inch Stainless Steel Exhaust System, 4.0-inch Black Quad Tips with Valves

Flowmaster Outlaw Axle-Back Exhaust System

In Stock
Free Shipping - Lower 48 US States
Advertised Price $1,699.95
$1,528.95
Save $171.00
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5

Emissions

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.

See Emissions Details

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Flowmaster introduces our Outlaw Axle-back exhaust system for the 2024-2026 Ford Mustang GT with the 5.0-liter engine or EcoBoost 2.3-liter engine and the factory performance exhaust option. This system uses the Outlaw style mufflers for an aggressive exhaust tone and increased performance. Maximum dyno gains of up to 17 hp and 17 lb-ft were measured at the rear wheels. 3.00-inch mandrel bent 409 stainless steel tubing is used to maximize exhaust flow and durability. Quad 4.00-inch black ceramic coated tips are used to add a custom look to this iconic vehicle. All of the necessary hardware is included and factory mounting locations are used for an easy installation. Fits both coupes and convertibles. Backed by Flowmaster's Lifetime Limited Warranty.

Features:

  • Max increases of up to 17 hp and 17 lb-ft over the stock exhaust at the rear wheels
  • Outlaw series performance muffler offers a deep powerful sound and increased performance
  • 409 stainless steel construction delivers extra durability and improved long-term corrosion resistance
  • Uses factory hanger locations for easy installation
  • 3.00-inch 16-gauge mandrel bent stainless steel tubing helps maintain maximum exhaust flow for better power
  • Includes all necessary hardware for an at home installation
  • Quad 4.00-inch black ceramic coated stainless steel tips add a custom look
  • Lifetime Limited Warranty

About Flowmaster

Shop the complete line of Flowmaster products for exhaust systems, mufflers, and more that deliver the iconic Flowmaster sound. Available at Holley.com!

Brand Flowmaster
California Proposition 65Yes
CARB (California) CompliantYes
Catalytic Converter IncludedNo
Catalytic Converter Quantity0
CategoryExhaust
Clamping TypeFlat Band
Clamps IncludedYes
Emission Code5
Exhaust SeriesOutlaw
Exhaust Tip ColorBlack
Exhaust Tip ConnectionWelded
Exhaust Tip CutAngled
Exhaust Tip Diameter4.00 IN
Exhaust Tip EdgeAngle Cut
Exhaust Tip FinishBlack Ceramic Coating
Exhaust Tip IntercooledNo
Exhaust Tip Length5.25 IN
Exhaust Tip Material304 Stainless Steel
Exhaust Tip Quantity2
Exhaust Tip ShapeRound
Exhaust Tip WallDouble Wall
Exit StyleDual Out Rear
FinishPainted
Gasket Or Seal IncludedNo
Grade TypePerformance
Hangers IncludedYes
Inlet TypeClamp-On
Main Piping Diameter3.00 IN
Mount TypeUses Factory Hangers
Mounting Bracket IncludedNo
Muffler (Left) Body Height4.00 IN
Muffler (Left) Body Length6.50 IN
Muffler (Left) Body Width4.00 IN
Muffler (Left) TypeReflection
Muffler (Right) Body Height4.00 IN
Muffler (Right) Body Length6.50 IN
Muffler (Right) Body Width4.00 IN
Muffler (Right) TypeReflection
Muffler Body Diameter4.00 IN
Muffler Body Height4.00 IN
Muffler Body Length6.50 IN
Muffler Body Material409 Stainless Steel
Muffler Body ShapeRound
Muffler Body Width4.00 IN
Muffler ColorBlack
Muffler FinishBlack High-Temperature Paint Finish
Muffler Flanged InletNo
Muffler Flanged OutletNo
Muffler IncludedYes
Muffler Inlet ConnectionSlip-Fit
Muffler Inlet Inside Diameter3.00 IN
Muffler Inlet LocationCenter
Muffler Inlet Outside Diameter3.13 IN
Muffler Outlet Diameter3.00 IN
Muffler Outlet LocationCenter
Muffler Outlet Quantity1
Muffler Overall Length6.50 IN
Muffler Part NumberKit Only
Muffler Quantity2
Muffler SeriesOutlaw
Muffler TypeReflection
Part TypeExhaust System
Pipe ColorSilver
Pipe Material409 Stainless Steel
Product TypeExhaust System
Sound LevelAggressive
Spring Bolt Kit IncludedNo
Sub CategoryExhaust and Tail Pipes
Tail Pipe Outlet Outside Diameter3.00 IN
Tail Pipe Quantity2
Dual
Tail Pipe Tapered OutletNo
Tip LogoEmbossed
TypeAxle-Back
Valve Actuator IncludedNo, Reuse OEM
Valve IncludedYes
Valve TypeOEM-Style Valves
UPC090127843833
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
Part Number818159
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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.
Instructions - 818159_instructionsV2.pdf
Instructions - Flowmaster Warranty 26 Update.pdf

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*Free Shipping and Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.

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

Flowmaster Outlaw Axle-Back Exhaust System
Flowmaster Outlaw Axle-Back Exhaust System
Advertised Price $1,699.95
$1,528.95
Save $171.00