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2019-20 GM Silverado/Sierra 1500 5.3L - FlowFX Direct-fit Dual Mode Muffler 717911YouTube Button

Flowmaster FlowFX Direct Fit Muffler Kit-Active Valve

2019-2021 (New body) GM Silverado/Sierra 1500 5.3L, 2/4 WD, All Wheelbases.

PART# 717911

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$645.00   Suggested Retail
$579.95   Holleydays Price
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Aggressive to moderate sound


Introducing the new FlowFX® Active Dual-mode muffler featuring our new W.A.V.E. Technology™ (Wireless Active Valve Exhaust™) for all 2019-2021 GM Silverado/Sierra 1500 (new body style) with 5.3L engine. This direct-fit replacement muffler has split personalities with a nice performance tone over the stock exhaust system, thanks to the Flowmaster® FlowFX performance muffler. The system also features a high quality wireless controlled actuator valve on the Power Chamber® redirecting exhaust through the turn down, giving you that deep open exhaust sound with just a push of a button. System features include mandrel-bent stainless steel construction leading into the Power Chamber, followed by a round FlowFX performance muffler that easily connects to the factory tailpipe. The Power Chamber houses a wireless controlled valve with a large 3.00-inch turndown dump style tailpipe letting everyone know who the Boss is once activated. Other system features include actuator motor, control unit, two wireless key fobs, all necessary wiring, hardware, and detailed instructions. Note: Fits 2019 (New body) 2/4 wheel drive and all wheelbases.


  • Deep Performance Tone from "Straight-through" FlowFX Muffler
  • Features Flowmasters W.A.V.E. Technology
  • Very Aggressive Active By-Pass Sound
  • Mandrel-bent Stainless Steel Tubing
  • Wireless Controlled Actuator Motor
  • Detailed Installation Instructions
  • Direct-fit Replacement Muffler
  • Includes a High Quality Valve
  • Stainless Steel Construction
  • Includes Two Key Fobs


Emission Code5
Exhaust SeriesFlowFX
Exit PositionDual Out Rear
Heat ShieldNo
Material409 Stainless Steel
Mount TypeUses Factory Hangers
Product TypeExhaust System
Single DualSingle
Sound LevelAggressive / Moderate
System TypeDirect-Fit Muffler
Tip CutTurndown
Tip Diameter3
Tip Length10
Tip Material409 Stainless Steel
Tip ShapeRound
Tip StyleRound
Single Wall
Tubing Diameter (in)3
Tubing Material409S Stainless Steel
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number717911



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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