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Stainless Works 1-7/8-Inch Long Tube Headers; Catted (15-20 GT)

Item 384846
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      Review & Installation 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

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Increases Horsepower and Torque
      • Long Tube Header Design
      • Free Flowing 1-7/8" Mandrel-Bent Tubing
      • Stainless Steel Construction - Natural Finish
      • Matching High-Flow Catalytic Converters
      • For Off-Road, Track Use Only
      • Designed and Manufactured in the USA
      • Fits Left Hand Drive Models Only
      • Fits 2015-2020 GT Mustangs with Factory Exhaust


      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 Catted Headers from AmericanMuscle. These Stainless Works Catted Headers will greatly improve your 5.0L Mustangs exhaust flow over the restrictive factory 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 Catted Headers are specifically designed to fit the 2015-2020 GT Mustang with the factory catback exhaust system installed.

      Technical notes. Not legal for use on pollution controlled motor vehicles; intended for off road use only.

      Please Note.These Headers are intended for left hand drive applications only.

      Fitment: 2015 2016 2017 2018 2019 2020

      MPN# M15HCAT

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (5)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 5 customers

      Installation Time: Weekend

      Installation Cost: $500-$1000

      • June 09, 2017

        5 2007 GT500 - MSJR Installation Time: Full Day


        These headers fit great, sound unreal and the quality is fantastic.

        Helpful (5)
      • June 01, 2017

        5 2016 GT - BertonS Installation Time: Shop Install Installation Cost: $500-$1000

        Great headers

        Since I am retired, I am not able to do all the repair type of work on my vehicles like I did in years gone by. However, adding headers was the first modification I have done to my 2016 Mustang GT that will boost the power. I did not want to greatly increase the volume level out of respect for my neighbors, but I did want the exhaust note that you can only get from headers. There were other mods which would have given more horsepower for the price, but I got exactly what I was looking for. There was one minor problem. After I got home from the shop, I noticed a small bolt which is used to hold down some piping, was actually touching the headers. I got a saw, mounted it onto a yardstick, and was able to cut off the excessive bolt length. Everything is fine now. Love these Stainless Works headers and a friend even mentioned the cars new sound as I drove by last week.

        Helpful (6)
      • August 12, 2016

        5 2015 GT - Adriancito

        Amazing sound

        The power and sound out of these is proceless! I combine it with borla type s and tune the car. Great results

        Helpful (6)
      • June 15, 2016

        5 2015 GT - Grnmnstr Installation Time: Weekend

        Flipped a switch

        Didnt realize how much power the car gains with these things...engine is a lot more responsive and definitely has more power due to not having restricted air flow. Would recommend this to anyone wanting more power for their car, but who doesnt want that?

        Helpful (6)
      • September 24, 2015

        5 2015 GT - Bono Installation Time: Afternoon

        Super amazing awesome loud!!

        I have some flow master super 10's on my 2015 mustang gt, I thought it sounded great at first, but when I paired them with SW long tubes the sound was out of this world!!! I couldn't believe how much louder it was with just headers. I'm looking to get the corsa extreme 3in in the future and I know it will be even more amazing!! 5 stars al around!!

        Helpful (6)

      Questions & Answers (29 answers)

      5 Top Rated Questions

      Will these fit the awe track edition cat back

      • The Stainless Works 1-7/8 in. Long Tube Catted Headers will work with the AWE Track Edition Cat-Back Exhaust.

      Helpful (3)

      will these headers work with my Corsa extreme cat back with double helix mid pipe that i already ordered from you guys?

      • These headers are designed to be used with the factory exhaust system and will not work with the Corsa exhaust. Stainless Works does make headers that will work with the Corsa exhaust which is this one here:

      Helpful (1)

      Will the catalytic converters on these long tube headers pass smog testing?

      • The Stainless Works 1-7/8 in. Long Tube Catted Headers would not pass the Smog testing in California no.

      Helpful (1)

      Does this fit the MBRP catback black series or do I need a mid pipe?

      Does this fit the MBRP catback

      10 More Questions
      Will this fit if I have a Sr performance x pipe with roush axle back? 1 answer
      Hello, does not limit the performance if there is a narrowing on the 2.5 inch pipe? Is not performance better to use the entire exhaust system with a diameter of 3 inches? And what you think is the best system in terms of performance. I have purchased a Ford performance by Borla Sport cat-back 2.5 inches and do not know whether to buy a larger diameter if I want better performance and better sound. Thank you in advance for the reply 1 answer
      I have a flowmaster outlaw axleback with a flowmaster scavenger x pipe. Will this bolt up? 1 answer
      Hello, Will these headers fit the *Ford Performance by Borla Sport Cat-Back Exhaust* (Item Number: 404455)? Thank you. 1 answer
      I have Roush axlebacks and Roush x-pipe currently on my 2017 S550. Will these headers drastically change idle and normal driving sound? I’m not concerned about WOT, just mainly idle and normal driving for my neighbors sake. 1 answer
      I have the Roush cat back with quad tips and want to add the Roush X-pipe resonator delete. Will these headers work with that system without any issues? 1 answer
      I understand that headers will make the exhaust louder, but will it change the tone of the exhaust as well? Or does it keep the same tone? I have a magnaflow axleback with SR performance x-pipe and hoping that this will make it more aggressive. 1 answer
      Will these work with a heart throb x pipe?? 1 answer
      Will these headers fit the stock set up, and what would the horsepower/torque gains be more or less??? 1 answer
      Will these fit MagnaFlow Cat-Back Quad Tip Exhaust Kit Competition Series 3" 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Driver Side Header
      • (1) Passenger Side Header
      • (4) Clamps
      • (2) O2 Extensions
      • Hardware

      Tech Specs

      Header Specifications
      Header Type:Long TubeType Mid Pipe Required:Stock Factory
      Material:Stainless SteelFinish:Natural
      Catalytic Converter:"Yes" - For off-road use onlyFitment:2015-2017 GT Mustangs