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Flowmaster American Thunder Cat-back Exhaust System

2019-2021 (New body) Chevrolet Silverado 1500/GMC Sierra 1500 with 5.3L engine. (See applications below)

Part # 817895 Be the first to write a review
Estimated shipping date: 01/31/2022
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The new Flowmaster® American Thunder® cat-back exhaust system for the 2019-2021 GM 1500 (new body style) trucks with 5.3L engine is perfect for the person looking for an aggressive sound level outside the truck, with a moderate interior tone and the performance benefits you would expect from Flowmaster. This emissions-legal bolt-on system fits all Crew Cab and Double Cab models with 5.5 and 6.5-ft long beds with factory dual exhaust option. Features include flex joint, mandrel-bent 3.00-inch stainless steel tubing flowing into a Super 40® Series muffler, dual 2.50-inch mandrel-bent stainless tailpipes that are finished off with quad 4.00-inch black ceramic coated stainless steel tips exiting out under the factory exhaust bezels. Designed for an easy fit, this system includes all necessary parts and hardware for an easy at home installation. Notes: Fits 2019-2020 Chevrolet Silverado 1500 and GMC Sierra 1500 Crew Cab and Double Cab models with 5.3L engine. Fits models with 5.5 and 6.5-ft long beds with factory dual exhaust option.


  • Large 4.00-inch Black Ceramic Coated Stainless Quad Tips
  • Moderate Interior with Aggressive Exterior Tone
  • Uses the Factory Hanger Locations
  • Large Volume Super 40 Muffler
  • Stainless Steel Construction
  • Lifetime Limited Warranty
  • 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
Emission Code5
Exhaust SeriesAmerican Thunder
Exit PositionDual Out Rear
Material409 Stainless Steel
Mount TypeUses Factory Hangers
Muffler SeriesSuper 40 Series
Product TypeExhaust System
Sound LevelAggressive / Moderate
System TypeCat-back
Tip Diameter4
Tip Material304 Stainless
Tip ShapeRound
Tubing Diameter (in)3/2.5
Tubing Material409S Stainless Steel
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817895

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.

Does Not fit 2019 LD/classic body style or trucks with factory single exhaust system.

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