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Flowmaster

Flowmaster 817713 Outlaw Axle-Back Exhaust Kit 3 Inch 409 Stainless Steel 4 Inch Polished 304 Stainless Steel Tips Compatible with 2015-2023 Ford Mustang 2.3L Ecoboost or 3.7L V6 Coupe Convertible

Based on 50 reviews
Condition: New
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$659.95

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Fulfilled by Magnum Exhaust

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At a glance

Condition
New
Dimensions
58.5 x 16.25 x 11.25 in
Weight
28.4 lb
Material
Plastic
Vehicle Service Type
Car
Inlet Connection Size
2.25 in
Automotive Fit Type
Vehicle Specific Fit
In the box
FLOWMASTER Outlaw Axle Back Exhaust System

Features 3

  • Dyno-tuned for Maximum Performance
  • Full Stainless Steel Construction
  • Aggressive Race Proven Outlaw Mufflers

Description

This Flow master Outlaw axle-back exhaust system is specifically designed for 2015-2019 Ford Mustang coupes or convertibles with 2. 3L Eco boost or 3. 7L engines. These systems feature race proven Outlaw mufflers for a very aggressive exterior sound level with a moderate interior sound level. Features include 2. 25-inch connections for an easy fit to the stock mid pipe then the inlets quickly expand to full 3. 00-inch mandrel-bent inlet tubing leading into a pair of the race proven Outlaw mufflers for maximum performance and sound. The system is supported from the factory hanger locations for an easy and hassle free installation that can be done at home and is finished off with large 4. 00-inch highly polished stainless steel tips for that performance look and sound that you've come to expect from Flow master.

Specs 22

Brand Flowmaster
Material Plastic
Item dimensions L x W x H 58.5 x 16.25 x 11.25 inches
Vehicle Service Type Car
Item Weight 28.4 pounds
Brand Name Flowmaster
Manufacturer Part Number 817713
UPC 700042032037

Frequently asked questions

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Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

Best mod for the S550 V6!
Review Image by Erwin S. Pajarillo
Review Image by Erwin S. Pajarillo
This is the best mod I’ve ever added to my 2015 Mustang V6! It sounds amazing! I’ve gotten so many compliments on how great it sounds. Several people mistake my V6 for the V8! It has a very low growl with an amazing low rumble. The only major downside is the drone noise at 2500 rpm. The drone noise makes my head hurt specially on long drives. ... show more
Reviewed in the United States on October 29, 2025 by Erwin S. Pajarillo
Doesn't sound like a ricer!!!
As for shipping, it came earlier than expected. Installation was a breeze. It took me roughly 30 minutes to install. I only did Axle-Back so I could see how it sounded. I really didnt wanna sound like a import with that horrible fart can sound. I was looking for a deep sound, something you would expect from a mustang. My personal opinion, this is as close as you get with a 4 banger. I'm very happy with the craftsmanship, Installation process and sound. Flowmaster lived up to their name with this setup. ... show more
Reviewed in the United States on March 22, 2023 by Gene K.
If you want the rumble this is for you!
I ordered these for my wife’s 2016 3.7 Mustang, they came with clear instructions and were fairly easy to install. I used a set of oil change ramps to gain clearance and it worked fine but would be easier if you have access to a lift. A reciprocating saw with a new metal cutting blade goes through the stock pipe with ease, just make sure to use a file to clean up the rough edges before installing the new pipes. I’m not a skilled mechanic and I had them on in just over an hour. The sound is better than I expected, I didn’t know you could get that kind of sound out of a V6! It is a little loud inside upon acceleration, but that’s what you want from a Mustang and Flowmaster! ... show more
Reviewed in the United States on April 21, 2023 by Kevin Woodall
Sounds better than the video
Sounds great, coupled it with an X pipe with one end capped off. Sounds even better than the video. If you have a V6 mustang and looking for sound go with these flow masters. Just make sure you also delete resonators and go with a Y or X mid pipe.
Reviewed in the United States on August 28, 2025 by L0rdZelda*
Great exhaust
Easy to install, well packaged and sounds perfect. This was for my sons car. I only used Flowmasters on my 1,200 HP Chevelle, but I did not know how they would sound on this Ecoboost 4 cylinder. To my surprise they sound amazing! Well worth it and great quality.
Reviewed in the United States on May 25, 2023 by SuperV3k900
No regrets with this purchase
Bros...This thing is a monster. Beautiful deep sound. I got it in my v6 manual Mustang coupled with a Roush H-pipe. There is some drone but I love it. I don't think I'll ever get tired of it. There is a part of me that wants to see how it sounds with the stock resonator but...maybe some day..For now I'm in love. ... show more
Reviewed in the United States on July 2, 2025 by able waka
This is the way
Made my 2020 Ecoboost way more fun and louder, Planning to add a Y- pipe and catless downpipe in the future, so this was the best axle-back I have ever heard for the EcoBoost!!!!!
Reviewed in the United States on April 13, 2021 by Donnyd510
Awesome
This flowmaster exhaust sounds amazing on my 2020 mustang ecoboost. Highly recommended to all the mustang owners
Reviewed in the United States on November 9, 2024 by Dayzee
How it works
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