2019-2025
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 4.3L Sierra 1500)Find parts that fit my vehicle
Item S503511
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$899.96
246 Reviews
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-10% $899.96 kit Was $999.95
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$299.00
Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- Total Cat-Back Exhaust System
- Premium 2.5" Stainless Steel Tubing
- Mandrel-Bent for Maximum Performance
- High-Power, Aggressive Sound
- Split Rear Exit w/ Dual Polished 3.5" Tips
- Bolt-On Installation
- Lifetime Limited Warranty
- Fits 2014-2018 4.3L GMC Sierra 1500 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
Steel Your Exhaust System the Right Way. When you're trying to show off the amazing sound of your 2014-2018 GMC Sierra's engine, then you're going to need the Flowmaster American Thunder Cat-Back Exhaust - Split Side/Rear Exit. Bringing together the complete stainless steel kit, the muffler, and the beautiful tips, you're going to feel the powerful sound and performance gains.
Stainless Steel Construction. The powerful design stainless steel brings complete all-weather protection and resilience to the table. The mandrel-bent piping also creates a superior flow increase over stock, cutting out any pressure points. There's nothing to hold it back.
The Loudness. The aggressive sound that you're going to hear when you drop the hammer on your accelerator is going to be heard by everyone around. Thanks to the Super 40 Series powering the exhaust through the 2.5-inch piping, the horsepower and torque that you're going to feel is amazing. And it'll look amazing, belting through split rear exits and brightly-polished 3.5-inch tips.
Bolt-On Install. This is designed to be a complete bolt-on installation with no modification necessary to your Sierra. You'll only need hand tools, a car lift or jack stands, and a friend to help you hold things in place. It should take a couple hours.
Warranty. This system is protected by a lifetime limited warranty covering material and manufacturing defects. Please see Flowmaster's full warranty for complete details.
Application. The Flowmaster American Thunder Cat-Back Exhaust - Split Side/Rear Exit is designed to fit 2014-2018 4.3L GMC Sierra 1500 models.
TECHNICAL NOTE: Designed for Double & Crew Cab Models. It is not compatible on 2WD Crew Cab Models 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) Muffler
- (2) Exhaust Tips
- 3 in. Piping
- Mounting Hardware
- Instruction Manual
Tech Guides:
4.6
Customer Reviews (246)
Questions & Answers
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Will It Fit My Sierra 1500
- 4.3L V6 - 14, 15, 16, 17, 18
Designed for Double & Crew Cab Models. It is not compatible on 2WD Crew Cab Models with 2-Piece Driveshaft.
