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Flowmaster FlowFX Cat-Back Exhaust System

Fits 2020-2022 GM 2500HD/3500HD 6.6-Liter Gas, Cat-Back, Dual Side Exit, Stainless Steel Exhaust System

Part # 718111
Estimated Ship Date: Coming Soon
Holley Days Price
$759.95
Suggested Retail
$845.00
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Emissions

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.

See Emissions Details
This Flowmaster® FlowFX® cat-back exhaust system for the 2020-2022 GM 2500HD/3500HD trucks with the 6.6-liter gas engine is manufactured using durable 409 stainless steel throughout and features 3.50 to dual 3.00-inch mandrel bent pipes for better exhaust gas flow, and a FlowFX "straight-through" muffler is used for a moderate sound level and maximum performance. Maximum increases on the dyno revealed +9 hp and +10 lb-ft at the rear wheels. This system exits out both sides, behind the rear wheels with 4.50-inch black ceramic tips for added style and a custom look. The system uses all the existing factory hanger locations and includes installation instructions and all necessary hardware for an easy installation that you can do at home. Backed by Flowmaster's Lifetime Limited Warranty.

Features:

  • Max increases of up to 9 hp and 10 lb-ft over the stock exhaust at the rear wheels
  • 3.50 to dual 3.00-inch mandrel bent 16-gauge 409 stainless steel tubing maximizes exhaust flow and improves durability
  • 4.50-Inch black ceramic coated tips add a custom look to the truck
  • Includes complete hardware and factory styled hangers in the stock locations for an easy installation
  • FlowFX “straight through” performance muffler delivers a deep, aggressive to moderate performance tone and improves exhaust flow

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 SeriesFlowFX
Exit PositionDOS
Mount TypeUses Factory Hangers
Muffler Body Length (in)18
Muffler ColorNatural
Muffler FinishBrushed
Muffler Inlet Diameter3.50
Muffler Inlet Diameter (in)3.50
Muffler Inlet LocationCentered
Muffler Material409S Stainless Steel
Muffler Outlet Diameter3.00
Muffler Outlet Diameter (in)3.00
Muffler Outlet LocationDual Outlet
Muffler Overall Length (in)24
Muffler Part NumberKit Only
Muffler Quantity1
Muffler SeriesFlowFX
Muffler ShapeOval
Muffler TypeAbsorption
Product TypeExhaust System
Single DualDual
Sound LevelModerate
System TypeCat-back
Tip CutAngle
Tip Diameter4.50
Tip Edge StyleRolled
Tip FinishBlack Ceramic
Tip Length11
Tip LogoEmbossed
Tip Material304 Stainless
Tip Quantity2.00
Tip ShapeRound
Tip StyleSingle Wall
Tubing Diameter (in)3.00
Tubing Material409S Stainless Steel
UPC090127130155
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
California Proposition 65 RequiredYes
Part Number718111
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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.
2020-2022 GM 2500HD/3500HD Trucks with 6.6-liter gas engines. Fits 2 & 4-wheel drive, Crew Cab with 6.5-foot bed only.

*Free Shipping & Handling only offered to the contiguous US on orders over $100, excludes clearance parts and oversized packages.

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