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Flowmaster Exhaust Systems Flowmaster Cat-back System 409S - Outlaw - Aggressive Sound - 817689

2,153 Reviews
$1,070.00
List Price
$962.95
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Features:
  • Part #: 817689
  • Main piping diameter: 3"
  • Super 10 Series Muffler
  • Includes dual 4" black ceramic coated exhaust tips
  • Includes exit pipes for dual rear or dual side exit
  • Flowmaster's Outlaw Cat-back exhaust system for the 2014-2018 GM Silverado and Sierra 1500 trucks (also fits 2019 classic models) is perfect for the person looking for maximum sound levels both inside and outside of the truck, with all of the performance benefits that you would expect from Flowmaster. This bolt-on DOR/DOS (Dual Out Rear or Dual Out Side) emissions-legal system for trucks with the 5.3L V8 engine features a stainless steel Super 10 Series muffler and dual mandrel bent 3.00 in. stainless steel tailpipes for maximum performance. The system also features Black Ceramic coated 4.00 in. double wall stainless steel tips. The exhaust system is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation. Note: Fits Crew Cab and Double Cab models only.
  • Outlaw Series™ Cat Back Exhaust System, Dual, Dual Rear Same Side Exit, 3.0 in. Tubing, Incl. Outlaw Mufflers/4 in. Pol. Tips, 409 Stainless Steel
  • Stainless Steel Construction, Aggressive Exterior Exhaust Tone, Black Ceramic Coated Tips, Lifetime Limited Warranty, Made in the USA
  • Download installation instructions (PDF)
  • With Dual Exhaust Tips
  • Dual Rear or Side Exit (409 Stainless)
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Product Info
Features:
  • Choose from up to four signature Flowmaster Exhaust series (depending on your vehicle):
  • Outlaw Series: Flowmaster’s most aggressive, race-oriented system perfect for drivers seeking loud sound levels
  • American Thunder: The sound that started it all, with Flowmaster’s original sound levels and performance
  • FlowFX: A moderate tone but without that "chambered" sound, this system still provides all that Flowmaster performance.
  • dBX Flowmaster: Perfect for smaller displacement four- and six-cylinder engines and can be used in both imported and domestic cars and trucks
  • Force II: Features a mild, chambered muffler tone for drivers seeking performance gains with quieter sounds
  • Custom-crafted for your specific year, make and model vehicle
  • Large-diameter mandrel-bent pipes deliver a restriction-free exhaust flow
  • Each kit is powered by Flowmaster's legendary high-performance mufflers
  • Available with single, dual, rear and side exit configurations (depending on your vehicle)
  • You have your choice of aluminized or stainless steel construction (depending on the kit)
  • Includes tubes, mufflers, tips, clamps, hardware & hangers and installation instructions (varies by kit)
  • Stainless steel systems are backed by a limited lifetime warranty
  • Aluminized steel systems are backed by a 3-year warranty
  • Flowmaster Exhaust is proudly made in the USA
Description:

The Flowmaster Exhaust System delivers more than a little sound and power – enjoy impressive horsepower gains, a handy boost in MPG, and the most famous exhaust tone in the automotive world. Not to mention, each Flowmaster Exhaust System is custom-bent from aluminized or stainless steel to fit your specific year, make and model.

Flowmaster has a wide range of different systems for you to choose from. If you want an all-out, loud exhaust system, go with the American Thunder. The Outlaw Series is an aggressive, race-oriented system and almost as loud. The FlowFX series has all that Flowmaster performance with a moderate tone. Sport compacts, imports and Euro machines sound off with the dBX Series, and, for wicked performance with a mild tone, the Flowmaster Force II System is best. Have your pick of single, dual, side and rear exits (depending on the model). Each kit is powered by performance mufflers and comes with all the parts you need for a quick install.

Your Flowmaster Exhaust System is backed by different warranties, depending on the materials used – for aluminized steel, you’re looking at a 3-year warranty, and for stainless steel, there’s a limited lifetime warranty.

Notes:
  • ATTN: State of California Consumers
    warning symbolWARNING: This product can expose you to chemicals including nickel (metallic) and chromium (hexavalent compounds) which are known to the State of California to cause cancer and birth defects, or other reproductive harm (For more information go to www.p65warnings.ca.gov)
Moss Warranty Act Statement

Thanks to the Magnuson Moss Warranty Act: US Code – Title 15, Chapter 50, Sections 2301-2312, your vehicle’s factory warranty is protected by law when you add aftermarket parts.
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Customer Reviews

Average Rating
Appearance
Ease of Installation
Price/Value
Quality
2153 Customer Reviews
5 Star
1505 (70%)
4 Star
517 (24%)
3 Star
83 (4%)
2 Star
30 (1%)
1 Star
18 (1%)

Love the Super 10

Bought the Super 10 for my 17 Chevy silverado. Love the sound. If you are looking for a system that sounds mean this is the one you want. Cold starts are loud, loud of the line. But at a constant 40 or 50 can barely hear anything.
Appearance
Ease of Installation
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Posted By Wesley L (Eatontown, NJ) / July 24, 2017
2017 Chevy Silverado
Yes
No

2014 GMC Sierra Flowmaster

The exhaust is awesome! Truck sounds really good. I have a cold air intake as well. Definitely notciable both inside and outside the vehicle. Highly recommended.
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Ease of Installation
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Posted By JonAnthony G (CLAY, NY) / April 12, 2017
2014 GMC Sierra
Yes
No

Flowmaster outlaw serious silverado

Sounds like there's a demon under my truck !!!!! AMAZING WOKE THE TRUCK UP
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Posted By Rasmandingo S (LITHONIA, GA) / December 17, 2016
2015 GMC Sierra
Yes
No

Flowmaster outlaw syetem

I like the sound alot, it does wonders for my GMC. Happy to havr. Also a gas saver. I did have one of the black tip scratched when it was shipped. Called and sent a picture. It was well rapped and boxed but scratched when put in the box. Called, sent picture of it and was told another was shipped to me. Not here yet must be coming by dog sled!
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Posted By Bruce D (CLIFTON PARK, NY) / October 18, 2016
2014 GMC Sierra
Yes
No

Flowmaster Outlaw system

Installed Flowmaster's Outlaw system on my new 2016 Chevy Silverado along with a K&N Intake. I immediately noticed horsepower gains and better fuel mileage. The only negative issue was noted during installation. The pipes did not properly secure onto each other with the provided clamps. You are required to spot weld or modify the pipes by cutting an opposing slot to the one factory cut, which will allow the pipes to secure onto each other with provided clamps. Flowmaster is aware of issue.
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Posted By Randy W (St. Albans, ME) / September 23, 2016
2016 Chevy Silverado
Yes
No

Great rumble

Installed on my 2016 1500 Silverado Z71. Took me 2 hours to get stock one off and flow master on. Only problem I had was with clamps. Tighten them all the way and exhaust system still moves. Used other clamps and is perfect now. Love the sound!
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Posted By Christopher M (Plainfield, IL) / September 4, 2016
Yes
No

Outlaw

The exhaust was a good fit and sounds great. Only problem is having to spend an extra $20 on better clamps cause the ones that are supplied DO NOT work.
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Ease of Installation
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Posted By Randall B (DELTON , WI ) / August 2, 2016
2014 GMC Sierra
Yes
No

FLOW MASTER OUTLAW

WOW!! What an amazing exhaust system The OUTLAW was easy to install an the Sound is SWEET Have always loved Flomaster exhaust system will always use them on all my vehicles Thank you AutoAnything for a super fast delivery an another fantastic product
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Posted By Mark H (GILBERT, AZ) / May 30, 2016
2016 Chevy Silverado
Yes
No

Awsome Sound

This exhaust is very aggressive. At idle it is very quiet with my 5.3 V8. With my foot on the pedal is very raspy and throaty. I'm always stepping on it cause it sounds great.
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Posted By Sean C (Irving, TX) / September 12, 2015
2011 Jeep Wrangler
Yes
No

Great Improvement for my Truck

This is a value becaused it adds power and save on gas.
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Posted By Ronald H (SAN MATEO, CA) / September 8, 2015
2015 GMC Sierra
Yes
No

Stick with American Thunder

The Outlaw note is a bit louder than what you hear in online videos. In my opinion I would save the money and go with the American Thunder. As far as installation goes, it's pretty straight forward but the quality of the brackets could be improved.
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Posted By John C (HAM LAKE, MN) / September 1, 2015
2015 Chevy Silverado
Yes
No

Flowmaster Exhaust

In my opinion, this was a great purchase! I had been fighting the decision for months since i bought my 2015 GMC Sierra, do i or don't i install and exhaust system? Well i finally decide yes, and boy am i satisfied with the sound! It was just the part i was missing. With a helper, i installed the entire system in my driveway in less than an hour and a half! Very easy, but it probably helped that my truck has a 6" lift on it! The sound is deep and just what i wanted, and the look is perfect
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Posted By Bill W (Charleston, SC) / April 7, 2015
2015 GMC Sierra
Yes
No

Quality Sound, Black Exhaust tips set it off.

Alright so everything was a breeze including assembly and installation, and the sound quality is exactly what I wanted. The only concern I have is my 5.3L V8 Sierra has the flex fuel where it kicks down to just 4Cyls. on the Highway or when cruising below a certain RPM. It goes into a deep subtle thudding during the transition from using 8 to 4. I'm pretty sure its just from back pressure, if anyone has an answer for this let me know I'm looking for a solution. Overall fantastic exhaust.
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Posted By Garrett W (HARRISBURG, NC) / November 15, 2014
2014 GMC Sierra
Yes
No
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