This Flowmaster® Outlaw® Cat-back exhaust system for the 2020-2023 Chevy Silverado and GMC Sierra 2500HD/3500HD trucks with the 6.6L 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 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
Fits Crew Cab with 6.5-foot bed length, 159-inch wheelbase only.
Will not fit models with 5th wheel tow hitch installed.
Installation Notes:
Fits Crew Cab with 6.5-foot bed length, 159-inch wheelbase only.
Will not fit models with 5th wheel tow hitch installed.
About Flowmaster
Manufacturer of performance exhaust systems, mufflers, performance air intakes, turbo boost modules, catalytic converters, race mufflers, headers and numerous exhaust accessories for late model cars, trucks, off-road, Jeeps, SUV’s, classic muscle cars, powersports vehicles and more. Flowmaster® gives you lots of exhaust choices with 12 designs of chambered mufflers, 3 styles of our exclusive “laminar-flow” mufflers and a new line of FlowFX “straight-through” performance mufflers, along with 5 sound categories of exhaust systems, giving you the customer, the power to custom tailor the sound of your vehicle whether you prefer mild, moderate or aggressive tones and sound levels. Since 1983, Flowmaster is the company you can trust, and has led the industry in offering only the best products you can buy for your vehicles.
Vehicle Fitment:
The Vehicle Fitment Guide is to be used as a general reference. The data has been provided by our suppliers and manufacturers and may contain errors or incorrect data. Always refer to a professional to verify correct fitment for your vehicle.
Make |
Model |
Submodel |
Years |
Engine |
Fitment Notes |
Chevrolet |
Silverado 2500 HD |
Custom |
2020 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
Custom |
2021 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
Custom |
2022 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
Custom |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
Chevrolet |
Silverado 2500 HD |
High Country |
2020 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
High Country |
2021 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
High Country |
2022 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
High Country |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
Chevrolet |
Silverado 2500 HD |
LTZ |
2020 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
LTZ |
2021 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
LTZ |
2022 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
LTZ |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
Chevrolet |
Silverado 2500 HD |
LT |
2020 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
LT |
2021 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
LT |
2022 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
LT |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
Chevrolet |
Silverado 2500 HD |
WT |
2020 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
WT |
2021 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
WT |
2022 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 2500 HD |
WT |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
Chevrolet |
Silverado 3500 HD |
Base |
2020 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
Base |
2021 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
Base |
2022 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
Base |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
Chevrolet |
Silverado 3500 HD |
High Country |
2020 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
High Country |
2021 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
High Country |
2022 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
High Country |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
Chevrolet |
Silverado 3500 HD |
LTZ |
2020 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
LTZ |
2021 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
LTZ |
2022 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
LTZ |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
Chevrolet |
Silverado 3500 HD |
LT |
2020 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
LT |
2021 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
LT |
2022 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
LT |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
Chevrolet |
Silverado 3500 HD |
WT |
2020 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
WT |
2021 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
WT |
2022 |
6.6L / 401 / V8 |
|
Chevrolet |
Silverado 3500 HD |
WT |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
GMC |
Sierra 2500 HD |
AT4 |
2020 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
AT4 |
2021 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
AT4 |
2022 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
AT4 |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
GMC |
Sierra 2500 HD |
Base |
2020 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
Base |
2021 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
Denali |
2020 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
Denali |
2021 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
Denali |
2022 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
Denali |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
GMC |
Sierra 2500 HD |
Pro |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
GMC |
Sierra 2500 HD |
SLE |
2020 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
SLE |
2021 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
SLE |
2022 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
SLE |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
GMC |
Sierra 2500 HD |
SLT |
2020 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
SLT |
2021 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
SLT |
2022 |
6.6L / 401 / V8 |
|
GMC |
Sierra 2500 HD |
SLT |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
GMC |
Sierra 3500 HD |
AT4 |
2020 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
AT4 |
2021 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
AT4 |
2022 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
AT4 |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
GMC |
Sierra 3500 HD |
Base |
2020 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
Base |
2021 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
Denali |
2020 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
Denali |
2021 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
Denali |
2022 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
Denali |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
GMC |
Sierra 3500 HD |
Pro |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
GMC |
Sierra 3500 HD |
SLE |
2020 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
SLE |
2021 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
SLE |
2022 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
SLE |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |
GMC |
Sierra 3500 HD |
SLT |
2020 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
SLT |
2021 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
SLT |
2022 |
6.6L / 401 / V8 |
|
GMC |
Sierra 3500 HD |
SLT |
2023 |
6.6L / 401 / V8 |
FITS CREW CAB, 6.5-FOOT BED TRUCKS ONLY |