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Flowmaster Outlaw Cat-back Exhaust System

2018-2021 Mustang GT 5.0L with Factory Active Performance Exhaust.

Part # 817800 Be the first to write a review
Estimated shipping date: 02/04/2022
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The Flowmaster Outlaw® Cat-back exhaust system is designed for 2018-2021 Ford Mustang GT 5.0L with the Factory Performance Active Exhaust option, and is perfect for the person looking for a very aggressive exhaust note both inside and outside the vehicle. This easy to bolt-on emissions-legal system features large dual 3.00-inch mandrel-bent stainless steel tubing with our exclusive Scavenger Series® X-pipe flowing into a pair of our race-proven Outlaw Series mufflers for a deep aggressive sound and maximum power. The exhaust system uses the factory hanger locations for an easy installation and the mufflers include our high quality exhaust valves and actuator stands to retain your factory actuator motors that control the active exhaust. The system finishes off with quad 4.00-inch black ceramic coated 304 stainless steel tips giving your Pony the look and sound it deserves. Like all Flowmaster® systems, the benefits include improved throttle response, power and mileage. The system includes all necessary parts, hardware and easy to follow instructions. Covered by our Lifetime Limited Warranty. Notes: Fits Coupes and Convertibles with Factory Active Exhaust.


  • Quad 4.00-inch Black Ceramic Coated Stainless Tips
  • Mandrel-bent 3.00-inch Stainless Steel Tubing
  • Includes Exclusive Scavenger Series X-pipe
  • Very Aggressive Interior/Exterior Sound
  • Dyno-Tuned for Maximum Performance
  • Uses the Factory Hanger Locations
  • 409S Stainless Steel Construction
  • Lifetime Limited Warranty
  • Flowmaster Quality

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
Catalytic Converter IncludedNo
Emission Code5
Exhaust SeriesOutlaw
Exit PositionDual Out Rear
Heat ShieldNo
Material409 Stainless Steel
Mount TypeUses Factory Hangers
Muffler Body Length (in)11
Muffler ColorBlack
Muffler FinishPainted
Muffler Inlet Diameter (in)3
Muffler Inlet LocationSide
Muffler Material409S Stainless Steel
Muffler Outlet Diameter (in)3
Muffler Outlet LocationDual
Muffler Overall Length (in)49.5
Muffler Part NumberKit Only
Muffler Quantity2
Muffler Series60 Series
Muffler ShapeOval
Muffler TypeReflection
Product TypeExhaust System
Single DualDual
Sound LevelAggressive
System TypeCat-back
Tip CutAngle
Tip Diameter (in)4
Tip Edge StyleRolled
Tip FinishBlack Ceramic
Tip Length (in)5.25
Tip LogoEmbossed
Tip Material304 Stainless
Tip Quantity4
Tip ShapeRound
Tubing Diameter (in)3
Tubing Material409S Stainless Steel
California Proposition 65 Chemical NameChromium (hexavalent compounds)
California Proposition 65 RequiredYes
Part Number817800

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 2018-2021 Mustang GT 5.0L Coupes & Convertibles with Factory Active Performance Exhaust Valves.

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    *Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

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