2020-2025
2015-2019
2007-2014
Installation Time
(approx) 2 Hours
Difficulty Level:
Light to Moderate mechanical skill required.
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Flowmaster American Thunder Dual Exhaust System with Polished Tips; Side/Rear Exit (11-19 6.0L Sierra 3500 HD)Find parts that fit my vehicle
Item SHG4303
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$1,006.16
245 Reviews
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-10% $1,006.16 kit Was $1,117.95
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- Moderate to Loud Sound Level
- Better Scavenging and Exhaust Flow for Increased Horsepower and Torque
- Delta Flow™ Super 40 Series Muffler
- Has 2.50-Inch Mandrel Bent Stainless Steel Tubing
- Features with 3-Inch Polished Stainless Steel Exhaust Tips
- Split Side or Dual Rear Exits
- Bolt-On Installation
- Designed for Double and Crew Cab Models
- Fits 2011-2019 6.0L Sierra 3500 HD Models
| Brand | Flowmaster |
| Exhaust System Type | Cat-Back System |
| Exhaust Tip Finish | Chrome, Polished |
| Exhaust Tubing Diameter | 2.50 Inch |
| Exhaust Material | Stainless Steel |
| Exhaust Tip Outlet Style | Dual |
| Exhaust Exit Location | Both Sides or Rear - After Tire |
| Exhaust Loudness | Moderate |
Description
Unique Flowmaster Sound. The Flowmaster American Thunder Cat-Back Exhaust emits a unique and powerful exterior exhaust note but keeps the interior sound level down to within comfortable levels. Indeed, Flowmaster’s patented Delta Flow technology is able to adjust both the interior and exterior sound levels. As a result, you can enjoy a comfortable ride with reduced sound levels inside the cab, while still turning heads with an aggressive exterior growl.
Boosts Overall Performance. Due to the Flowmaster’s Delta Flow technology, your truck is sure to experience improved scavenging. When matched with the system’s mandrel-bent tubing, the result is a much smoother exhaust flow. This then leads to improvements in horsepower, torque, throttle response, and even fuel efficiency.
Premium Stainless Steel Construction. The American Thunder Cat-Back is constructed from premium stainless steel. This allows for both outstanding durability and longevity, as well as minimizing the need for frequent maintenance over time.
Bolt-On Installation. The American Thunder Cat-Back Exhaust makes use of factory mounting holes and can be bolted on easily with basic hand tools. It also comes with the option of having a dual side or dual rear exit configuration. Flowmaster recommends welding all slip-fit connections for a more secure installation.
Application. The Flowmaster American Thunder Cat-Back Exhaust with split side or rear exits is designed to fit 2011-2019 6.0L Sierra 3500 HD models.>
Boosts Overall Performance. Due to the Flowmaster’s Delta Flow technology, your truck is sure to experience improved scavenging. When matched with the system’s mandrel-bent tubing, the result is a much smoother exhaust flow. This then leads to improvements in horsepower, torque, throttle response, and even fuel efficiency.
Premium Stainless Steel Construction. The American Thunder Cat-Back is constructed from premium stainless steel. This allows for both outstanding durability and longevity, as well as minimizing the need for frequent maintenance over time.
Bolt-On Installation. The American Thunder Cat-Back Exhaust makes use of factory mounting holes and can be bolted on easily with basic hand tools. It also comes with the option of having a dual side or dual rear exit configuration. Flowmaster recommends welding all slip-fit connections for a more secure installation.
Application. The Flowmaster American Thunder Cat-Back Exhaust with split side or rear exits is designed to fit 2011-2019 6.0L Sierra 3500 HD models.>
Fitment:
- 2011 GMC Sierra 3500
- 2012 GMC Sierra 3500
- 2013 GMC Sierra 3500
- 2014 GMC Sierra 3500
- 2015 GMC Sierra 3500
- 2016 GMC Sierra 3500
- 2017 GMC Sierra 3500
- 2018 GMC Sierra 3500
- 2019 GMC Sierra 3500
Flowmaster 817541
CA Residents: 
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Installation & What's in the Box
Installation Info
What's in the Box
- (1) Inlet Pipe
- (1) 6.50-Foot Bed Extension
- (1) Muffler
- (1) Tailpipe, Right
- (1) Tailpipe, Left Front
- (1) Tailpipe, Left Rear
- (2) Side Exit Pipes (Right and Left)
- (2) Rear Exit Pipes (Right and Left)
- (2) Stainless Tips
- Installation Hardware
4.6
Customer Reviews (245)
Questions & Answers
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Will It Fit My Sierra 3500
- 6.0L V8 - 11, 12, 13, 14, 15, 16, 17, 18, 19
Designed for Crew Cabs with a Standard Box
