KEF Flowmaster 818112 20 21 Gm 2500Hd 6.6L Cc/Sb Otl Dor/ P14814281KEF-F13818112 https://cdnimages.opentip.com/full/KEF/KEF-F13818112_2.jpg Flowmaster 818112 20 21 Gm 2500Hd 6.6L Cc/Sb Otl Dor/ Manufacturer Part Number: 818112Exhaust System Kit; Outlaw ® Cat-Back System; Stainless Steel; With Muffler; 3 Inch Pipe Diameter; Single Exhaust With Dual Exit; Rear Exit; 4 Inch Round Angle-Cut Polished Stainless Steel TipAttributes Sound Level: Aggressive Type: Cat-Back Exhaust Type: Single Outlet Type: Dual Exit Position: Rear Exit Material: Stainless Steel Diameter (IN): 3 Inch Includes Muffler: Yes Includes Exhaust Tip: Yes Exhaust Tip Style: 4 Inch Round Angle-Cut Exhaust Tip Material: Stainless Steel Muffler Quantity: 1 Includes Exhaust Pipe Muffler Delete: No Muffler Configuration: Single Inlet, Dual Outlet Includes Hardware: Yes Required Welding: No Estimated Install Time (Hours): 2 Product Description This Flowmaster ® Outlaw ® Cat-back exhaust system for the 2020-2022 Chevy Silverado and GMC Sierra 2500HD/3500HD trucks with the 6.6 Liter gas engine, 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 Horsepower and 9 Pound Feet over the stock exhaust at the rear wheels. Designed for the Crew Cab, Standard Bed 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. Designed for an easy fit, this system features all necessary parts and hardware for installation.Features & Benefits Mandrel Bent 16 Gauge 409 Stainless Steel Tubing Maximizes Exhaust Flow And Improves Durability Max Increases Of Up To 9 Horsepower And 9 Pound Feet Over The Stock Exhaust At The Rear Wheels Dual 4.00 Inch Polished Stainless Steel Tips Add A Custom Look Super 10 Series Performance Muffler Delivers A Deep, Aggressive Performance Tone And Improves Exhaust Flow Features Complete Hardware And Factory Styled Hangers In The Stock Locations For An Easy Installation Limited Lifetime Warranty This Fits2020-2023 Chevrolet Silverado 2500 HD2020-2023 Chevrolet Silverado 3500 HD2020-2023 GMC Sierra 2500 HD2020-2023 GMC Sierra 3500 HD 14814281 090127130162 133.8000lbs 0.00 0.00 0.00

Flowmaster

839.6265 2025-06-09 Only 2 left In Stock Flowmaster 818112 20 21 Gm 2500Hd 6.6L Cc/Sb Otl Dor/

Flowmaster 818112 20-21 Gm 2500Hd 6.6L Cc/Sb Otl Dor/

Brand Flowmaster

Shop more from KEF

* Click "Add to Cart" to calculate shipping and delivery time.

Share & Earn 10% Cash Back Best Price in Bulk

Best Price in Bulk!

Because we are a major distributor for some products, we price very aggressively by sacrificing profit margin whenever we sell in bulk. The philosophy to offer quality products with little mark up has created unmatched customer loyalty for some successful membership based stores. Unlike those wholesale to public membership clubs, we do not charge any membership fee. Some merchants offer FREE shipping, but when you buy quantity 10, you pay 10 times total. Essentially, you are paying 10 times on shipping. We don't think that is fair to you. Why? Most of the time, shipping a 10 lb parcel does not cost 10 times of a 1 lb parcel.

Here is an example:

Opentip	Others
Product Price: $8	Product Price: $20
Shipping for quantity 1: $12	Shipping: FREE
Quantity: 10	Quantity: 10
Total Shipping for quantity 10: $18	Total Shipping: FREE
Subtotal: $98 Saving: $102 (51%)	Subtotal: $200

Don't be shy. If you discover any competitor outselling us in a particular product, whenever you purchase in large quantity, please bring it to our attention. Most of the time, we will match or beat their price, and give you a credit. If we lose to a competitor, it is our shame. We then know we need to work harder in sourcing to create values for you.

* Price comparison must be based on comparable brands or models and in bulk quantity purchase.

Optional related products

Flowmaster 717977 19-21 Gm 1500 Truck 5.3L Ffx-Ext

$329.37

Flowmaster 717930 14-21 Ram 2500 6.4L Dor/S Amt 409S

$599.64

Flowmaster 717943 17-21 Super Duty 6.2L/7.3L Ffx Cb S

$619.95

Flowmaster 717976 14-19 Gm 1500 4.3L/5.3L Ffx-Ext

$329.37

Flowmaster 717978 15-20 Ford F-150 V6-V8 Ffx-Ext

$389.97

Flowmaster 818110 07-18 Wrangler Jk 3.6L/3.8L Otl-Ext

$380.20

Flowmaster 17395 Amer Thndr Gm Msle 99-05

$489.45

Flowmaster 17403 F150 Singl Pipe Exhst04-6

$536.60

Flowmaster 717910 17-19 Nissan Titan 5.6L Cb Sos Ffx

$815.95

Flowmaster 717894 2019 Gm 1500 5.3L Ffx Dor Oem Tips

$809.32

Flowmaster 17470 Exh Kt Chv/Gm 1/2T 96-99

$734.05

Flowmaster 817409 Gm A Body 68-72

$936.00

Flowmaster 817891 2019 Silverado/Sierra 1500 6.2L C

$1,015.95

Flowmaster 817689 Kit Outlaw 14 Gm 1500

$996.02

Product Description

Manufacturer Part Number: 818112

Exhaust System Kit; Outlaw ® Cat-Back System; Stainless Steel; With Muffler; 3 Inch Pipe Diameter; Single Exhaust With Dual Exit; Rear Exit; 4 Inch Round Angle-Cut Polished Stainless Steel Tip

Attributes

Sound Level: Aggressive
Type: Cat-Back
Exhaust Type: Single
Outlet Type: Dual
Exit Position: Rear Exit
Material: Stainless Steel
Diameter (IN): 3 Inch
Includes Muffler: Yes
Includes Exhaust Tip: Yes
Exhaust Tip Style: 4 Inch Round Angle-Cut
Exhaust Tip Material: Stainless Steel
Muffler Quantity: 1
Includes Exhaust Pipe Muffler Delete: No
Muffler Configuration: Single Inlet, Dual Outlet
Includes Hardware: Yes
Required Welding: No
Estimated Install Time (Hours): 2

Product Description

This Flowmaster ® Outlaw ® Cat-back exhaust system for the 2020-2022 Chevy Silverado and GMC Sierra 2500HD/3500HD trucks with the 6.6 Liter gas engine, 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 Horsepower and 9 Pound Feet over the stock exhaust at the rear wheels. Designed for the Crew Cab, Standard Bed 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. Designed for an easy fit, this system features all necessary parts and hardware for installation.

Features & Benefits

Mandrel Bent 16 Gauge 409 Stainless Steel Tubing Maximizes Exhaust Flow And Improves Durability
Max Increases Of Up To 9 Horsepower And 9 Pound Feet Over The Stock Exhaust At The Rear Wheels
Dual 4.00 Inch Polished Stainless Steel Tips Add A Custom Look
Super 10 Series Performance Muffler Delivers A Deep, Aggressive Performance Tone And Improves Exhaust Flow
Features Complete Hardware And Factory Styled Hangers In The Stock Locations For An Easy Installation
Limited Lifetime Warranty

This Fits

2020-2023 Chevrolet Silverado 2500 HD
2020-2023 Chevrolet Silverado 3500 HD
2020-2023 GMC Sierra 2500 HD
2020-2023 GMC Sierra 3500 HD

Attention CA Residents: Prop 65 Warning

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.