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Stainless Works 1-7/8 in. Long Tube Off-Road Headers (15-17 GT)

Market Price $1,595.99 You Save 12% ($185.24)
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  • Item 384847
  • MPN# M15HOR

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    Features, Video & Details

    • Increases Horsepower and Torque
    • Long Tube Header Design
    • Free Flowing 1-7/8" Mandrel-Bent Tubing
    • Stainless Steel Construction - Natural Finish
    • For Off-Road, Track Use Only
    • Designed and Manufactured in the USA
    • Fits Left Hand Drive Models Only
    • Fits 2015-2017 GT Mustangs with Factory Exhaust

    Review & Installation Video

    Review & Install Video

    Hey guys, Justin with, here with my detailed review of the Stainless Works 1-7/8" Long Tube Header fitting your 2015 and up Mustang GT, available with your choice of either off-road or cat. Now, if you're looking at long tube headers, then chances are you've probably already taken care of some of the bolt-on basics, or most of the bolt-on basics, and are at the point now in your set-up where you want to add even more power and sound. Now most people will tell you, "Yes, they are expensive. Yes, they're going to be a pain in the you-know-what to install, but they're most certainly worth it." In fact, gains of 20-plus wheel with a quality tune is not uncommon, and that's on naturally aspirated set-ups. So, with all that said, why would you want to go with these Stainless Works option for your ride? Well, when browsing long tube options here at AM, you're really not going to be making a bad choice no matter what company you go with, whether it be Stainless Works, Kooks, American Racing, they're all very much top quality, and they're all going to perform as intended. That being said, Stainless Works, this is all they do. They're primarily a header company first, that also happens to dabble in exhaust systems. So they're focus, their knowledge in the long tube market is a big plus, and in my opinion, it definitely comes through in the final product. Now, as I mentioned earlier guys, if you want to get a good set of quality long tube headers, you're going to be making a sizable investment. So if you're looking at 304-grade stainless quality TIG welds throughout, you're going to be looking in the $1,000 to $2,000 range depending on what brand you go with, and Stainless Works fall right in line with that. The catted version like I have on the table here is going to be $1,300 to $1,400 range, the off-road version will be slightly cheaper than that. Now you can put together a slightly more affordable set-up and go with a BBK, for instance, but in my opinion, the quality, materials and build really isn't going to measure up like the Stainless Works here. Quickly running down the materials here with the Stainless Works, you should know they only use a material known as everlast 304-grade stainless steel for the build of their headers. Definitely going to be a premium metal. In addition to that, we are looking at C&C mandrel bends throughout, laser cut 3/8" flange here, three inch merge style collector, all made in the U.S.A., very nice quality TIG welds here. The welds are actually pretty beautiful on this thing, and it's all backed by a lifetime warranty. Now again, you can grab this in an off-road version if you like, that'll be a little bit more affordable. This is the catted version, again, with me on the table here, so expect to see the two high flow cats included in the package there. Also in the package, you're going to get brand new hardware, gasket maker, O2 extensions, basically everything you need to get these things installed. However, my one small nit-pick here with the Stainless Works options is they do not include brand new exhaust manifold gaskets. Not a huge deal, really, but just something to point out. A friendly reminder here guys, this is a 1-7/8 version of the long tube header, and I think you'll find it's going to be the most commonly offered diameter when it comes to long tubes for your Coyote powered S550 GT, and for good reason. It's going to be just fine for your mild bolt-on naturally aspirated set-ups, but it's going to be plenty of header to grow into when you do eventually go forced induction. Now, with that said, if you do have your heart set on a 1-3/4" version of a long tube header, well Kooks, American Racing, and Borla all have you covered with their versions here on the site. As for the install here guys, well, you do have to support the motor, remove the motor mounts in order to get these things in place, or drop the sub-frame, whatever method you prefer, I figure a full three out of three wrenches on my difficulty meter. A full day in the garage, 12-pack, and a decent set of tools should help you get through this install. Now I don't like to say this often, but if you don't feel confident tackling this job, don't be afraid to leave this one in the hands of your local shop. All right guys, to wrap this one up, whether you're going off-road or catted, the Stainless Works Long Tube Headers are gong to offer a superb build quality, great materials, along with that lifetime warranty, all things you really like to have on your side when dropping down big cash for a mod like this. So be sure to check out more from Stainless Works for your GT here at

    More Horsepower And Torque. Improve the performance of your 5.0L Coyote powered S550 Mustang throughout the entire RPM range with Stainless Works Long Tube Off-Road Headers from AmericanMuscle. These Stainless Works Off-Road Headers will greatly improve your 5.0L Mustangs exhaust flow over the restrictive stock manifolds to significantly increase your Pony's horsepower and torque.

    Superior Construction. Manufactured in the USA from 1-7/8" mandrel bent 304 stainless steel tubing for superior airflow, Stainless Works Long Tube Exhaust Headers are TIG welded and feature a one piece 3/8" thick header flange for added strength and optimal leak-free performance.

    Recommended Upgrade. To realize the full power potential that these Long Tube Headers have to offer, AmericanMuscle highly recommends a Bama custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

    Application. These Stainless Works Long Tube Off-Road Headers are specifically designed to fit the 2015-2017 GT Mustang with the stock catback exhaust system installed.

    Technical notes. Not legal for use on pollution controlled motor vehicles; intended for off road use only.These Headers are intended for left hand drive applications only.

    Fitment: 2015 2016 2017 Details

    What's in the Box
    • (1) Driver Side Header
    • (1) Passenger Side Header
    • (4) Clamps
    • (2) O2 Extensions
    • Hardware
    Installation Info
    Tech Specs
    Header Specifications
    Header Type: Long Tube Type Mid Pipe Required: Stock Factory
    Material: Stainless Steel Finish: Natural
    Catalytic Converter: "No" - For off-road use only Fitment: 2015-2017 GT Mustangs
    Will it fit my Mustang?

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    9 Questions / 6 Answers

    Ask a Question

    Will this work with a roush x-pipe?


    • These Stainless Works 1-7/8 in. Long Tube Off-Road Headers will not work with the Roush X-pipe. These would connect to the cat-back directly.


    Helpful (0)

    Will this fit my stainless works lmf cat back ? This says the header fits stock exhaust and my cat back was a complete bolt on so it should fit?


    • It will not as this is designed for the stock catback system. If you have a Stainless works catback, you want to get a Stainless Works header specifically designed to fit with a Stainless Works catback exhaust. We offer two options, I will post them below:


    Helpful (0)

    will these headers fits on Ford Performance by Borla Sport Cat-Back Exhaust?


    • These Stainless Works 1-7/8 in. Long Tube Off-Road Headers are designed to work with the factory cat-back exhaust and other exhausts with factory like mounting points. The Ford Performance by Borla Sport Cat-Back Exhaust, item 384388/384389 will fit with these headers.


    Helpful (0)

    Do I need the cats for my car to run properly? I have a 2017 Mustang GT with the Roush 727hp kit. w/E85.


    • With a proper tune, your computer can be calibrated to operate properly with out catalytic converters. Without a tune, the vehicle will run poorly.


    Helpful (0)

    Will I need to order extra o2 extensions for the rear o2 sensors?


    • You will not need to order extra O2 extensions for the rear O2 sensors.


    Helpful (0)

    reading the other questions about these i feel like they'll fit but will these headers fit a roush axle back exhaust with a resonator delete?


    • Hi, These headers are specifically designed to fit the 2015-2017 GT Mustang with the stock catback exhaust system installed a axle back can be added to your factory exhaust we can not guarantee fitment with a resonator delete.

      Chris J

    Helpful (0)

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    Customer Reviews (11) Write a Review

    Overall Rating 5.0

    out of 5 stars

    Installation Time:Full Day

    • Loudness / Volume 4.909091 4.9
    • Exhaust Note 4.909091 4.9
    • Fit & Finish 4.909091 4.9
    • Bang For Your Buck 4.818182 4.8

    • 5/5

      Installation Time: Afternoon

      January 21, 2018


      Had MBRP cat back exhaust already and she sounded good but after putting these on when you get on it it is LOUD!!! Daily driving isn't much different than before and if you don't get in the throttle you won't even know how loud it Is! Definetly worth the money!!


      Year: 2015 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Weekend

      January 02, 2018

      stainless works headers

      The part looks great. install time was lengthy but im sure it is well worth it. waiting on the new tune from BAMA before starting the car. Its -14 outside and snow on the ground so i wont be able to really test out the performance for a few more months.


      Year: 2017 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Full Day

      November 18, 2017

      Great fit

      This WILL fit your stock exhaust or your aftermarket exhaust that was a direct bolt on with no cutting. I hope this helps some of you looking for the right fitment.


      Year: 2015 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Full Day

      October 10, 2017

      Give your mustang a new attitude

      I decided to take the plunge and get long tubes for my 17 GT I went with stainless works and I could not be happier! The fit and finish are second to none! To say it gave my mustang a new attitude is an understatement! WOW!


      Year: 2017 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Afternoon

      July 03, 2017


      Best mod on my car so far . The power gains are very noticeable and the engine definitely breathes way better and the sound from these is just awesome. I did the install in about 4hrs on a lift without any problems


      Year: 2016 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Full Day

      October 23, 2016

      First class quality

      Loved the headers , great fit sounds awesome I'd buy again for sure


      Year: 2016 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Afternoon

      June 06, 2016

      Great product

      Fit and finish are great and is reasonably priced. I got the off-road version and it screams!!!


      Year: 2016 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Full Day

      April 01, 2016

      Install was a pain but worth it!

      Installed these off-road headers with a Borla cat back and it sounds great. The install took about 8 hours for both headers and cat back. Be ready for the passenger side bolts on headers to give u issues but other than that well worth it.


      Year: 2015 Submodel: GT

      Helpful (9)

    • 5/5

      Installation Time: Less than 1 Hour

      March 18, 2016

      Long tube header

      You can really feel the difference once they're in. You're car will pull a lot harder


      Year: 2015 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Weekend

      February 23, 2016

      Totally pleased with my purchase

      I did a lot of research before purchasing headers, like most people do. I wanted to get something that was worth it for me financially and something I could find a lot of research on, since I was installing myself. The headers were boxed very well. There were no issues with packaging, nothing poking out of the box. I did a good review of the headers and they appeared to be perfect. The install was awful, but that's because it was my first time doing it and no lift. Overall, I'm very pleased. Sounds amazing with my Gibson cat back and I can feel the new added power!


      Year: 2016 Submodel: GT Tampa, Florida

      Helpful (5)

    • 5/5

      Installation Time: Weekend

      November 02, 2015

      Great Product

      These make the Mustang sound like how it should. The install is definitely not for the faint of heart, but they are well worth it.


      Year: 2015 Submodel: GT Spring Hill, FL

      Helpful (4)

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