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Flowmaster American Thunder Axle-Back Resonator Delete Kit

2019-2021 Ram 1500 (New body) Trucks with 5.7L engine and factory dual tailpipes.

PART# 817850

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Moderate sound


The new American Thunder axle-back resonator delete kit features stainless steel construction with larger 2.50-inch mandrel-bent tubing replacing the small factory 2.25-inch tailpipes and resonators. The "resonator delete" tailpipes exit in the stock location, utilize the factory hanger locations are finished off with large 4.50-inch diameter black ceramic coated 304S stainless steel tips, giving your RAM some bark to go with its bite. Includes installations instructions and all necessary hardware for a quick and easy at home installation. Note: Fit 2/4 wheel drive trucks and all wheelbases except trucks with the factory single tailpipe.


  • Large 4.50-inch Black Ceramic Coated Tips
  • Uses the Factory Hanger Locations
  • All Stainless Steel Construction
  • Mandrel-bent 16 Gauge Tubing
  • Deletes Factory Resonators
  • Quick and Easy Installation
  • Lifetime Limited Warranty


Catalytic Converter IncludedNo
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear
Heat ShieldNo
Material409 Stainless Steel
Mount TypeUses Factory Hangers
Muffler Part NumberNo Muffler
Product TypeExhaust System
Single DualDual
Sound LevelModerate
System TypeAxle-back
Tip CutAngle
Tip Diameter (in)4.5
Tip Edge StyleRolled
Tip FinishBlack Ceramic
Tip Length (in)11
Tip LogoEmbossed
Tip Material304 Stainless
Tip Quantity2
Tip ShapeRound
Tubing Diameter (in)2.5
Tubing Material409S Stainless Steel
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817850



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

Does Not fit 2019-2021 Classic body trucks.


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