Flowmaster Cat-back and Axle-back Exhaust Systems for the 2018 Jeep Wrangler JLYouTube Button

Flowmaster American Thunder Cat-back Exhaust System

2018-2019 Jeep Wrangler JL with 3.6L engine. Fits 2/4 door models.

PART# 817819

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Fits 2018-2019 Jeep Wrangler JL 2 Door and 4 Door with 3.6L engine.


This Flowmaster American Thunder® Cat-back exhaust system for the 2018-2019 Jeep Wrangler JL 2 and 4Dr models with the 3.6L is perfect for the person looking for a moderate to aggressive exterior and mild interior exhaust tone, with all of the performance benefits that you would expect from Flowmaster®. This bolt-on DOR (Dual Out Rear) emissions-legal system features a 2.50-inch mandrel bent stainless inlet pipe, a specially designed stainless steel resonator to keep the interior resonance down to a minimum, a stainless steel 80 Series™ cross-flow muffler, and dual 2.50-inch mandrel bent tailpipes. The system finishes with large dual 4.00-inch black ceramic coated Flowmaster stainless steel tips for a stealthy modern look. The system is designed for a perfect fit and includes all necessary parts and hardware for easy installation you can do at home.


  • Large 4.00-inch Black Ceramic Coated Exhaust Tips
  • Moderate to Aggressive Exterior Performance Tone
  • 80 Series Cross-flow Performance Muffler
  • Mandrel-Bent Stainless Steel Tubing
  • Minimal Interior Resonance
  • Lifetime Limited Warranty
  • Easy Installation


California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Catalytic Converter IncludedNo
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDOR
Heat ShieldNo
Mount TypeUses Factory Hangers
Muffler Body Length (in)15
Muffler ColorBlack
Muffler FinishPainted
Muffler Inlet Diameter (in)2.5
Muffler Inlet LocationOffset
Muffler Material409S Stainless Steel
Muffler Outlet Diameter (in)2.5
Muffler Outlet LocationDual Outlet - Offset (Same Side)
Muffler Overall Length (in)32
Muffler Part NumberKit Only
Muffler Quantity1
Muffler Series80 Series
Muffler ShapeOval
Muffler TypeReflection
Product TypeExhaust System
Single DualDual
Sound LevelModerate/Aggressive
System TypeCat-back
Tip CutAngle
Tip Diameter (in)4
Tip Edge StyleCut
Tip FinishBlack Ceramic Coat
Tip Length (in)5.25
Tip LogoEmbossed
Tip Material304 Stainless
Tip Quantity2
Tip ShapeRound
Tip StyleDouble Wall
Tubing Diameter (in)2.5
Tubing Material409S Stainless Steel
Part Number817819


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 2018-2019 Jeep Wrangler JL 2 Door and 4 Door with 3.6L engine.


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