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Flowmaster Outlaw Cat-back Exhaust System

All 2018-2021 Jeep Wrangler JL Unlimited 4-door models with 3.6L engine. High Clearance.

Part # 817818
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Estimated shipping date: 02/10/2022
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This Flowmaster® Outlaw® Cat-back exhaust system replaces the factory transverse muffler on 2018-2021 Jeep Wrangler Unlimited 4-door models with the 3.6L engine, including the Sahara 3.6L with Hybrid E-torque option. The system relocates the muffler into a position right behind the catalytic converter where it is tucked up into the frame and out of harm's way when navigating rocky terrain. The system is constructed from 409S stainless steel, features a race-proven Outlaw series muffler for an aggressive exterior with a moderate interior sound level in the cab and the single 2.50-inch mandrel-bent stainless steel tailpipe is re-routed to run up and over the rear sway bar and exits up high at the rear bumper to provide maximum clearance for extreme crawling. The system is finished off with a polished 3.00-inch stainless steel tip. Note: Does Not fit 2-door models.


  • Race-proven Outlaw Performance Muffler
  • Provides Maximum Off-Road Clearance
  • Uses the Factory Hanger Locations
  • 2.50-inch Mandrel-bent Tubing
  • Dyno Tuned For Maximum HP
  • Stainless Steel Construction
  • Lifetime Limited Warranty
  • Flowmaster Quality
  • Includes Hardware
  • Easy Installation

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 PositionSingle Rear Exit
Heat Shield IncludedNo
Material409 Stainless Steel
Mount TypeUses Factory Hangers
Muffler Body Length (in)11
Muffler ColorBlack
Muffler FinishPainted
Muffler Inlet Diameter (in)2.5
Muffler Inlet LocationCentered
Muffler Material409S Stainless Steel
Muffler Outlet Diameter (in)2.5
Muffler Outlet LocationCentered
Muffler Overall Length (in)18.5
Muffler Part NumberKit Only
Muffler Quantity1
Muffler SeriesOutlaw
Muffler ShapeRound
Muffler TypeReflection
Product TypeExhaust System
Single DualSingle
Sound LevelAggressive / Moderate
System TypeCat-back
Tip CutAngle
Tip Diameter (in)3
Tip Edge StyleCut
Tip FinishPolished
Tip Length (in)4.75
Tip LogoEmbossed
Tip Material304 Stainless
Tip Quantity1
Tip ShapeRound
Tubing Diameter (in)2.5
Tubing Material409S Stainless Steel
California Proposition 65 Chemical NameChromium
California Proposition 65 RequiredYes
Part Number817818

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.

2018-2021 Jeep Wrangler JL Unlimited 4-door models with 3.6L engine, including the Sahara 3.6L with Hybrid E-torque option. Does Not fit 2-door models.

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