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2007-18 Jeep Wrangler JK - American Thunder Axle-Back Muffler Delete - 817942YouTube Button

Flowmaster American Thunder Axle-Back Exhaust System

2007-2018 Jeep Wrangler JK with 3.6L/3.8L, Muffler Delete

PART# 817942

$133.95   Suggested Retail
$119.95   Your Price
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The Flowmaster American Thunder Axle-back exhaust system for the 2007-2018 Jeep Wrangler JK is perfect for the enthusiast looking for maximum performance and ground clearance. The 2.50-inch tailpipe features a mandrel bent 409 stainless steel design for performance and corrosion resistance. The tailpipe is finished off with a 3.00-inch polished 304 stainless steel tip and fits both 2 and 4 door models with the 3.6L or 3.8L engine. This system replaces the factory transverse muffler reducing weight, improves ground clearance, and provides a moderate sound level. Because this system tucks the tailpipe up high, an aftermarket metal bumper is generally recommended. The exhaust system is covered by our Lifetime Limited Warranty. Designed for a perfect fit, this system includes all necessary parts and hardware for easy and quick installation you can do at home in about 15 minutes.


  • Max Dyno Gains of 5 HP and 7 Lb.Ft. Torque
  • Provides Maximum Clearance for Off-Roading
  • Mandrel Bent Pipe Increases Exhaust Flow and Performance
  • Stainless Steel Construction Offers Great Corrosion Resistance
  • Utilizes the Factory Mounting Points for an Easy Installation
  • Moderate Sound Level
  • Backed by Flowmaster’s Lifetime Limited Warranty


Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionSingle Out Rear
Mount TypeUses Factory Hangers
Muffler Part NumberN/A
Muffler SeriesNot Included
Product TypeExhaust System
Single DualSingle
Sound LevelModerate
System TypeAxle-back
Tip CutAngle
Tip Diameter3.00
Tip Edge StyleCut
Tip FinishPolished
Tip Length4.75
Tip LogoEmbossed
Tip Material304 Stainless
Tip Quantity1.00
Tip ShapeRound
Tip StyleSingle Wall
Tubing Diameter (in)2.50
Tubing Material409S Stainless Steel
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817942



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.

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