Flowmaster

Flowmaster 818112 Outlaw Cat-Back Exhaust 3.5 to Dual 3 in Dual Rear Exit

Fits 2020-2021 GM® Silverado®/Sierra® 2500HD/3500HD Crew Cab 6.5' Bed and 6.6L Gas V8. This product is not created or sold by GM®.

Part # 818112
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$808.95
Suggested Retail
$899.00
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5

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® Outlaw® Cat-back exhaust system is perfect if you are looking for an aggressive sound level inside and outside of the truck, with all of the performance benefits that you would expect from Flowmaster®. Maximum increases of up to 9 hp and 9 lb.ft. over the stock exhaust at the rear wheels. Designed for the Crew Cab, Standard Bed (6.5 ft.) models only, this bolt-on, emissions-legal system features a stainless steel Outlaw series muffler and large dual 3.00-inch 409 stainless steel mandrel-bent tailpipes that can be configured to exit either dual straight out the back, or dual out the sides behind the rear wheels which is best suited for towing applications. The system is finished off with polished 4.00-inch 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 installation.

Features:

  • Max increases of up to 9 hp and 9 lb.ft. over the stock exhaust at the rear wheels
  • 3.50-inch and 3.00-inch mandrel bent 16-gauge 409 stainless steel tubing maximizes exhaust flow and improves durability
  • Dual 4.00-inch polished stainless steel tips add a custom look
  • Includes complete hardware and factory styled hangers in the stock locations for an easy installation
  • Super 10 Series performance muffler delivers a deep, aggressive performance tone and improves exhaust flow
  • Backed by Flowmaster’s Lifetime Limited Warranty
  • Can be configured to exit straight out the rear or out the side depending on preference
Brand Flowmaster
Emission Code5
Exhaust SeriesOutlaw
Exit PositionDOR/S
Inlet Diameter (in)3.50
Mount TypeUses Factory Hangers
Muffler Body Length (in)6.5
Muffler ColorBlack
Muffler FinishPainted
Muffler Inlet Diameter (in)3.5
Muffler Inlet LocationCentered
Muffler Material409S Stainless Steel
Muffler Outlet Diameter (in)3.0
Muffler Outlet LocationDual Outlet
Muffler Overall Length (in)12.375
Muffler Quantity1
Muffler Series10 Series
Muffler ShapeOval
Muffler TypeReflection
Product TypeCat-Back Exhaust Systems
Sound LevelAgressive
System TypeCat-Back
Tip CutAngle
Tip Diameter4.0
Tip Edge StyleCut
Tip FinishPolished
Tip Length (in)13
Tip Material304 Stainless Steel
Tip Quantity2
Tip ShapeRound
Tip StyleDouble Wall
Tubing Material409S Stainless Steel
UPC090127130162
Manufacturer Part Number818112
California Proposition 65 Chemical NameChromium (hexavalent compounds)
Nickel (Metallic)
Part Number818112
5

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.
Fits Crew Cab with 6.5-foot bed length, 159-inch wheelbase 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.