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2014-19* GM Silverado/Sierra 1500 4.3L, 5.3L - Force II Cat-back Exhaust System 817666YouTube Button

Flowmaster Force II Cat-back Exhaust System

2014-2019* (*Classic body) GM Silverado/Sierra 1500 4.3L & 5.3L engines.

PART# 817666

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Moderate sound


This is the Force II® cat-back exhaust system for the 2014-2019* (*Classic body) Chevrolet Silverado/GMC Sierra 1500 trucks with 4.3L or 5.3L engines. This exhaust system is perfect for the person looking for a moderate sound level outside the vehicle, but with a minimal sound increase inside the cab. Features include all stainless steel construction, a Super 50™ Series muffler, and dual 2.50-inch stainless steel mandrel-bent tailpipes. The system can be configured to exit either straight out the back under the rear bumper, or out the sides behind the rear tires for towing. It is then finished off with a pair of large 3.50-inch polished stainless steel tips and is covered by our Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for an easy installation you can do at home.


  • Large 3.50-inch Polished Stainless Steel Tips
  • Super 50 Series Performance Muffler
  • Uses the Factory Hanger Locations
  • Multiple Exit Styles Provided in Kit
  • All Stainless Steel Construction
  • Lifetime Limited Warranty
  • Powerful Exterior Sound
  • Minimal Interior Sound
  • Mandrel-bent Tubing
  • Easy Installation


Emission Code5
Exhaust SeriesForce II
Exit PositionDual Out Rear / Dual Out Side
Heat ShieldNo
Inlet Diameter (in)3
Material409 Stainless Steel
Muffler Part NumberKit Only
Muffler Quantity1
Muffler SeriesSuper 50 Series
Outlet Diameter (in)2.5
Product TypeExhaust System
Single DualDual
Sound LevelModerate
System TypeCat-back
Tip Diameter (in)3.5
Tip Length (in)13
Tip Quantity2
Tubing Diameter (in)2.5
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number817666

Service Parts



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 Crew Cab 2WD with 2 Pc Driveshaft or 2019 New body style. Fits 2/4 Wheel Drive Crew cab and Double cab with 5.5 or 6.5-ft beds.


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

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