2019-2025
2014-2018
2007-2013
1999-2006
Installation Time
(approx) 1 Hour
Difficulty Level:
Simple installation for anyone.
Installation Guides
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Flowmaster Outlaw Extreme Single Exhaust System; Turn Down (14-18 5.3L Sierra 1500)Find parts that fit my vehicle
Item S510689-53
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$363.56
175 Reviews
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-10% $363.56 kit Was $403.95
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$299.00
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2014-19* GM Silverado/Sierra 1500 5.3L - Outlaw Extreme Cat-Back Exhaust System 817916
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Product Information
Features, Description, Reviews, Q&A, Specs & Installation
Features & Specs
- Produces a Deep and Aggressive Exhaust Sound
- Enhances Exhaust Flow for Increased Power and Torque
- Straight-Through Muffler Design
- Made From High-Strength, 409 Stainless Steel, 3-Inch Mandrel-Bent Tubing
- Comes in a Black Painted Finish
- Easy Installation With Minor Cutting
- Uses Factory Hangers
- Backed by a Limited Lifetime Warranty
- Made in the USA
- Fits All 2014-2018 5.3L GMC Sierra 1500 Models
| Brand | Flowmaster |
| Exhaust System Type | Cat-Back System |
| Exhaust Tip Finish | No Tips |
| Exhaust Tubing Diameter | 3.00 Inch |
| Exhaust Material | Stainless Steel |
| Exhaust Tip Outlet Style | No Tip |
| Exhaust Exit Location | Turn Down |
| Exhaust Loudness | Aggressive |
Description
Powerful Aggressive Note. Reinforce your Sierra’s powerful stance with an equally fierce exhaust sound by installing the Flowmaster Outlaw Extreme Turn-Down Single Exhaust System. The Outlaw muffler particularly delivers a race-oriented exhaust note.
Performance Boost. This Outlaw Extreme cat-back exhaust provides an efficiently powerful performance. It is specifically engineered using race-proven Outlaw Muffler Technology to maximize exhaust flow while minimizing temperature. In addition, Flowmaster uses cool shell technology in its internal design providing a significant reduction in exterior muffler temperature. As a result, improved exhaust performance is prolonged with more power and efficient fuel utilization.
Reliable Toughness. The Outlaw Exhaust System is made of premium-quality 409 stainless steel. This highly corrosion-resistant material is also reinforced with a black painted finish for extra durability. This construction ensures a long-lasting service life even with prolonged off-road use.
Simple Installation. Designed for easy installation, this Outlaw Extreme Single Exhaust System requires cutting the stock muffler. It will easily fit your truck’s factory mounting locations using the provided hanger keepers. The installation process completes with moderate mechanical skills required.
Application. The Flowmaster Outlaw Extreme Turn-Down Single Exhaust System is intended for use on all 2014-2018 5.3L GMC Sierra 1500 models.
Fitment:
- 2014 GMC Sierra 1500
- 2015 GMC Sierra 1500
- 2016 GMC Sierra 1500
- 2017 GMC Sierra 1500
- 2018 GMC Sierra 1500
Flowmaster 817916
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
- (1) Band Clamp
- (2) Hanger Keepers
4.7
Customer Reviews (175)
Review Summary
Installation Time: Less than 1 Hour
Sep 19, 2023
2016 SLT - 16sierra5point3
Installation Time: Afternoon
Drone
This exhaust sounds amazing but the drone on the highway is unbearable. Would be perfect for an off road rig or racing setup, but not a DD.
Performance Gain 3/5
Fit & Finish 5/5
Loudness (Volume) 2/5
Exhaust Note 5/5
Bang For Your Buck 5/5
May 12, 2023
2017 SLT - Calledtoarms
Installation Time: Less than 1 Hour
dissappointed
Not sure what happened to it. Haven’t had time to take it apart again. First couples weeks it sounded great. Just like I wanted. Now all of a sudden it’s quiet. Making weird noises like it’s not opening up all the way. Honestly don’t know what’s going on.
Fit & Finish 3/5
Loudness (Volume) 3/5
Exhaust Note 3/5
Performance Gain 2/5
Bang For Your Buck 2/5
Jun 11, 2022
2014 SLT - Blainevoss
Installation Time: Less than 1 Hour
Flowmaster outlaw extreme
Instal is very simple. Start up sounds great but driving there isn’t much noise. You here more engine noise then you do the exhaust while driving. One downside is the drone on the highway when it switches to v4 mode is really annoying. But over a good exhaust and would buy again. Especially for that cold start sound.
Fit & Finish 5/5
Loudness (Volume) 3/5
Exhaust Note 4/5
Performance Gain 3/5
Bang For Your Buck 0/5
Apr 27, 2022
2015 SLT - Kramer1500
Installation Time: Less than 1 Hour
2015 Sierra 5.3L
Easy to install and sounds great. Would definitely buy again!
Fit & Finish 5/5
Loudness (Volume) 5/5
Exhaust Note 5/5
Performance Gain 5/5
Bang For Your Buck 5/5
Apr 19, 2022
2015 SLE - carsonjh
Installation Time: Less than 1 Hour
2015 gmc sierra 1500 sle double cab
great sound, great deal, it is loud when you want it to be. cold starts are loud. i have noticed a difference in throttle response. was easy to install, took about 20 minutes. hardest part was removing the stock exhaust from the hangers. very happy with the purchase. definitely worth the money.
Fit & Finish 5/5
Loudness (Volume) 5/5
Exhaust Note 5/5
Performance Gain 5/5
Bang For Your Buck 5/5
Apr 2, 2022
2018 Base - BlindRoofer
Installation Time: Less than 1 Hour
Outlaw extreme fits on Regular cab
Easy install with a sawzall, and or hand grinder, and new blades/wheels for each. I’ve got this exhaust on my work truck paired up with an afe intake, silver bullet throttle body spacer, and consider the range afm disabler mandatory. No one can beat me to the job.
Fit & Finish 5/5
Loudness (Volume) 5/5
Exhaust Note 4/5
Performance Gain 5/5
Bang For Your Buck 5/5
Mar 11, 2022
2017 SLE - Dwoodie17
Installation Time: Less than 1 Hour
Awesome
Installed in less than 30 min and sounds great! Easy to do and the tone is great. Well worth it for a bolt on exhaust!
Fit & Finish 5/5
Loudness (Volume) 5/5
Exhaust Note 5/5
Performance Gain 5/5
Bang For Your Buck 5/5
Apr 25, 2021
2015 Base - Jay562
Question
Do you only have to cut if you don’t have a 6.5ft bed I wanted the carven dump exhaust that one is direct bolt on without cutting anything It won’t fit a crew cab apparently..
Fit & Finish 0/5
Loudness (Volume) 0/5
Exhaust Note 0/5
Performance Gain 0/5
Bang For Your Buck 0/5
Feb 26, 2021
2018 SLT - Jimmiegame
Installation Time: Afternoon
EXACTLY WHAT YOU WANT!!!
Voids no warranties, perfect aggressive grumble, only loud when you want it to be, well hidden, and easy install; you won't be able to install this without cutting. The cold start is loud on especially cold days, and if you think its too loud for you give yourself a three week waiting period to adjust it won't bother you afterwards and you'll fully enjoy it!!
Fit & Finish 4/5
Loudness (Volume) 3/5
Exhaust Note 5/5
Performance Gain 3/5
Bang For Your Buck 5/5
Jan 9, 2021
2014 SLE - Jscc
Installation Time: Less than 1 Hour
Just Awsome
The outlaw pipe is just amazing! The sound is perfect, make the truck look very good too! ????
Fit & Finish 4/5
Loudness (Volume) 5/5
Exhaust Note 5/5
Performance Gain 4/5
Bang For Your Buck 5/5
Questions & Answers
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Will It Fit My Sierra 1500
- 5.3L V8 - 14, 15, 16, 17, 18
Designed for Double Cab and Crew Cab Models
