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2015-20 Challenger Hellcat 6.2L, SRT 6.4L - American Thunder Cat-Back Exhaust System 817739YouTube Button

Flowmaster American Thunder Cat-back Exhaust System

2015-2020 Dodge Challenger Hellcat, Demon, SRT392, R/T Scat-Pack with 6.2L or 6.4L engine and 2017-2020 R/T with 5.7L engine.

PART# 817739

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$992.00   Suggested Retail
$891.95   Your Price
Estimated shipping date: 12/11/2020
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Aggressive to moderate sound


This American Thunder® Cat-back exhaust system is designed for the 2015-2020 Dodge Challenger Hellcat and Demon with the 6.2L engine, the SRT392 and R/T Scat Pack models with the 6.4L engine, as well as the 2017-2020 R/T with the 5.7L engine and is perfect for the person looking for an aggressive exterior sound level while maintaining a moderate interior sound with all of the performance benefits that you would expect from Flowmaster®. This bolt-on 409S stainless steel system features mandrel-bent dual 3.00-inch tubing flowing into our exclusive Scavenger Series® X-pipe assembly for maximum power and a deep unique tone. The tubing then flows into a pair of specially built Super 40 ®Series mufflers and the tailpipes include "dummy valve stands" to fool your factory actuators into thinking they're still operating the OE valves. This way, you always have that "wide-open" sound and performance without throwing a code. The stainless steel tailpipes are finished off with Quad 3.50-inch polished 304 stainless steel tips exiting within the rear bumper valence. The system uses the factory hanger locations for an easy installation and is covered by our Lifetime Limited Warranty. Includes all necessary parts and hardware for installation. Note: This system eliminates the Factory Exhaust Valves and provides "Dummy" valve stands so the Factory Acutators still work without throwing off a code.


  • Exclusive Scavenger X-pipe for Maximum Horsepower and Torque
  • Large 3.00-inch Mandrel-bent Dual Exhaust System
  • Includes "Dummy Valve Stands" for OE Actuators
  • Quad 3.50-inch Polished 304 Stainless Steel Tips
  • Dyno Tuned For Maximum Performance
  • Uses the Factory Hanger Locations
  • Stainless Steel Construction
  • Lifetime Limited Warranty
  • Deep Powerful Sound
  • Easy Installation


Catalytic Converter IncludedNo
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear
Heat ShieldNo
Inlet Diameter (in)1
Material409 Stainless Steel
Mount TypeFlanged
Muffler Part NumberKit Only
Muffler Quantity2
Muffler SeriesSuper 40 Series
Muffler TypeWelded Baffle
Outlet Diameter (in)3
Product TypeExhaust System
Single DualDual
Sound LevelAggressive / Moderate
System TypeCat-back
Tip CutAngle
Tip Diameter (in)3.5
Tip Edge StyleCut
Tip FinishPolished
Tip Length (in)9.5
Tip LogoEmbossed
Tip MaterialStainless Steel
Tip Quantity4
Tip ShapeRound
Tubing Diameter (in)3
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817739



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 2015-2020 Dodge Challenger Hellcat, Demon, SRT392, R/T Scat-Pack with 6.2L or 6.4L engine and 2017-2020 R/T with 5.7L engine.


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