2019-2024
2014-2018
2007-2013
1999-2006
Installation Time
(approx) 2 Hours
Difficulty Level:
Light to Moderate mechanical skill required.
Installation Guides
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Flowmaster American Thunder Dual Exhaust System; Side/Rear Exit (14-18 5.3L Sierra 1500)Find parts that fit my vehicle
Item S503512
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$999.95 kit
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- Aggressive Sound
- Race Bred
- Quality 2.5" Stainless Steel Construction
- 3.5" Tips
- Bolt-On Installation
- Lifetime Warranty
- Fits 2014-2018 5.3L GMC Sierra 1500 Double & Crew Cab Models
- Not Compatible w/ 2WD Crew Cab Models with 2-Piece Driveshaft
| 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
Sounds as Advertised. With the Flowmaster American Thunder Cat-Back Exhaust you get what you would expect. Big, aggressive sound both inside and outside of your Sierra 1500. With this system installed, people will know you are coming their way.
A History of Performance. Flowmaster got their start in racing, so it is no wonder that all of their systems carry this heritage forward. Each system is tuned on a dynamometer and provides improved throttle response, horsepower, torque and gas mileage to your Sierra 1500.
Premium Materials. The Flowmaster American Thunder Cat-Back Exhaust is an emissions legal system that is made from mandrel bent, 16 gauge stainless steel. The main tubing is 2.5" in diameter and exits on either the side or the back - your choice - with 3.5" tips. Aggressive sound. Aggressive look.
Quick & Easy Install. It just makes sense to use installation points that already come on your Sierra 1500. The Flowmaster American Thunder Cat-Back Exhaust is a bolt-in system that will fit the first time. After all, you want to spend more time driving than underneath your rig.
Strong Warranty. Flowmaster systems are proudly made in the USA and have a Lifetime Limited Warranty. Contact Flowmaster directly for more details and terms.
Application. The Flowmaster American Thunder Cat-Back Exhaust -Split Side/Rear Exit fits 2014 thru 2018 5.3L Sierra 1500 Double & Crew Cab Models (Not Compatible on 2WD Crew Cab Model with 2-Piece Driveshaft).
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Fitment:
- 2014 GMC Sierra 1500
- 2015 GMC Sierra 1500
- 2016 GMC Sierra 1500
- 2017 GMC Sierra 1500
- 2018 GMC Sierra 1500
Flowmaster 817669
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) Split Side/Rear Exit Exhaust
- Hangers & Hardware
Tech Guides:
4.6
Customer Reviews (241)
Questions & Answers
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Will It Fit My Sierra 1500
- 5.3L V8 - 14, 15, 16, 17, 18
Designed for Double & Crew Cab Models. It is not compatible on 2WD Crew Cab Models with 2-Piece Driveshaft.
