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Stainless Power 1-7/8 in. Long Tube Off-Road Headers (15-19 GT)

Market Price $1,166.63 You Save 12% ($134.22)
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$1,032.41 (pair)

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  • Item 390796-B
  • MPN# SM15HOR

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    Features, Video & Details

    • Increases Horsepower and Torque
    • Long Tube Header Design
    • 1-7/8" Primary Tubes with 3" Collector
    • 3" Off-Road Connection Pipes (Steps Down to 2.5")
    • Free Flowing Mandrel-Bent Tubing
    • 304 Stainless Steel Construction - Natural Finish
    • Intended for Off-Road, Track Use Only
    • Tune Needed
    • 24-Month Guarantee on Material and Workmanship
    • Designed by Stainless Works
    • Fits Left Hand Drive Models Only
    • Fits 2015-2019 GT Mustangs with Factory 2.5" Exhaust

    Review & Installation Video

    Review & Install Video

    Hey guys, Stephanie with, here with a review of the Stainless Power Long Tube Off-Road Headers available for 2015 and up S550 GT Mustangs. In this video, we're going to be looking at a few different things in regards to these headers. We're gonna talk about the materials and construction of the headers themselves, and the install, too. We'll talk more about this later but I can tell you right now that long tube headers make for a difficult install. So I'm gonna call this one a three out of three wrenches on the difficulty meter. The stainless power off-road long tube headers are going to be a good option for someone looking for a natural finish long tube that's going to eliminate the use of cats, and maintain three inch connection pipes that'll step down to two and a half inch for a cat-back. The connection pipes that come with these headers are three inch off-road pipe that do have that step down, which means that you'll need a two and a half inch mid pipe. Long tube headers are going to offer both performance and sound gains, but the end result of your headers will depend on the rest of your setup. The runners on these particular headers are one and seven-eighths inch, which is slightly different than a one and three-quarter inch offering. Traditionally you see forced induction cars running a larger runner, and NA cars running a smaller runner, but I wouldn't really say that that's a hard and fast rule, especially with the new Coyotes. So you don't need to have forced induction to run a one and seven-eighths diameter runner. You just need to keep in mind your current mods and the goals that you have for your car when you're looking around, as well as what going with this size runner will do to your power demand with the mods that you have. If you have some bolt-ons in your steel NA, you might see a hit on your low end torque. But once you spin the Coyote motor up, the larger diameter is what's going to help keep things moving, so you'll see top end gains. Getting into the specifics here, these are a 304 stainless steel header that have a natural, or a raw finish, which is gonna be different than a chrome or ceramic coated header. It obviously doesn't have the polished appearance a chrome header would have. While these don't have the ceramic coating either, they are made from that 304 stainless steel tubing, so you won't have to worry about corrosion. Not to mention, you get to see the beautiful welds since these do have that raw finish. This is mandrel-bent tubing which is gonna help a smoother air delivery. The primary tubes then merge down to a three inch collector with venturi-style merge spikes that are gonna optimize the exhaust flow. Then the header flanges up here are also laser cut, and they do that to prevent leaks and create a good fit. Then you have your connection pipes here. Like I said earlier, they are three inch, and they're not catted, and they are going to step down to two and a half inches. That means that you can bolt up to your factory cat-back, or an aftermarket two and a half inch one, so you have some flexibility there. If you didn't know already, when you change your header set up to a long tube setup, you also need to change your mid pipe to a shortening mid pipe to work with the long tubes. So just keep the two and a half inch requirement in mind when you pick out your mid pipe. If we move on to price, as we all pretty much know, or you'd know if you'd been shopping for long tubes, that they're going to be a solid investment. They're pricey and they're difficult to install. The option from stainless power, since they are a higher quality item made from great materials, are going to be on the more expensive side. The one and seven-eighths inch option that we have here are gonna be slightly more expensive than the smaller runner, which isn't unusual. You do tend to see the larger runners costing more than the smaller runners, but not usually by very much at all. You can figure on spending between $800 and $900 for a set of these. But do keep in mind that you will still need a shortening mid pipe in order to install these. So you can figure on purchasing that as well. And that's why I called long tube headers an investment earlier. But you do have to keep in mind all the benefits and power that you'll be getting from this setup. And to put things in perspective, it's not just these headers that are gonna be expensive. You're gonna be looking at headers costing over a grand or very close to 1,000 bucks anyways. As for the install on this one, long tubes are always going to be a difficult install. I don't say this often, but if you don't have a helping hand or you don't have much experience, it might be better to just take the car to a shop for the install. If you do tackle this yourself, it's going to be a full three out of three wrenches on the scale, and a day in the garage, especially considering that you'll be installing a mid pipe with these headers. And you can do this on a jack and stands, but a lift would make this easier for sure. You're gonna need your toolbox for this one with an assortment of different sockets, wrenches, and extensions. You're looking at things like disconnecting the steering shaft, dropping the starter, and removing a motor mount. A lot of this install obviously requires working in some pretty tight areas, so while everything is straightforward, getting access and maneuverability is actually tricky, which is why you need to pull a motor mount on one side. This allows you to raise the motor slightly with a jack to give you some more room. Having a helping hand in this case is really gonna benefit you, but a day of rustling and some pretty penny spent in these mods is totally worth it in my opinion. So wrapping things up with the Stainless Power Long Tube Off-Road Headers, these are 304 stainless steel headers with one and seventh-eighth inch runners and three inch collectors that run down to three inch connection pipes that will step down to two and a half inches. As usual, you can check them out more online for yourself, right here at

    Give Each Cylinder More Exhaust Pumping Space.

    Rather than having them share a manifold, give your cylinders each their own exhaust pipe with these Stainless Power 1 7/8 in. Long Tube Off-Road Headers. Through their own 1-7/8" primary tubes and 3 inch off-road lead pipes, each cylinder will pump out more exhaust, increasing your Mustang's torque and power. Mandrel bending further enhances air flow.

    Superior Construction.

    Stainless Power Headers are manufactured to Stainless Works exact design specifications. Stainless Power Headers are CNC mandrel bent from 1-7/8" diameter, 304 stainless steel tubing for excellent exhaust flow and long lasting corrosion resistance. These Long Tube Headers feature TIG-welded construction, as well as laser-cut, 3/8 in. header flanges for additional strength and leak-free performance.

    24-Month Guarantee.

    Stainless Power is Stainless Works value-line brand of exhaust products designed for the cost conscious consumer that wants a high-quality product at a reasonable price. Stainless Power is so confident in the quality of its Long Tube Headers that they are backed by a 24-Month guarantee on material and workmanship.

    Calibration Required.

    Installation of these Long Tube Headers will require the use of a Handheld Tuner to reprogram your Mustang's computer (ECU) for proper operation. By reprogramming the ECU, you will be able to realize the full power potential that these Long Tube Headers have to offer.


    These Stainless Power 1-7/8 in. Long Tube Off-Road Headers are specifically designed to fit the 2015-2019 GT Mustang equipped with the Coyote 5.0L DOHC V8 engine. These headers and connector pipes are a direct bolt on to the stock 2.5" exhaust system.

    Technical Note. 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 2018 2019 Details

    CA Residents: Warning: California's Proposition 65

    What's in the Box
    • (1) Driver Side Header
    • (1) Passenger Side Header
    • (1) Driver Side Connection Pipe
    • (1) Passenger Connection Pipe
    • (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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    Questions & Answers (13)

    5 Top Rated Questions

    What is the difference between the Stainless Power Catted Headers and the Stainless Power Off-Road Headers? Which one is louder and would sound better with a Corsa Xtreme Catback Exhaust? Thanks AM!

    • The main difference is in the catalytic converters. As far as sound in conjunction with the Corsa Xtreme catback exhaust, since the Off-Road headers do not have the catalytic converters and are more free flowing they will have a slightly better sound.

    Helpful (1)

    Will this fit perfectly with a borla atak 3 inch catback?

    • These will indeed work with the Borla catback due to the supplied adapters that come with the headers, as long as they match up size wise.

    Helpful (0)

    Will these work perfect perfect with the mbrp catback race. Or will I have problems. 2017 gt

    • Unfortunately, this will not be a bolt-on installationfor the MBRP cat-back exhaust. The MBRP long tube headers and the Stainless Works that is designed to work with the MBRP exhaust will be a bolt up installation. 

    Helpful (0)

    Will these work perfect perfect with the mbrp catback race. Or will I have problems.

    • Unfortunately, this part will not work with the MBRP cat back exhaust, you would need to use theMBRP headers or these headers by Stainless Works: &

    Helpful (0)

    Will this header fit with 3'' AWE track edition catback exhaust? Thanks.

    • These Stainless Power 1-7/8 in. Long Tube Off-Road Headers will be 3" but will step down to 2.5" when it connects to the cat-back. If you have this AWE cat-back it will work as this steps down to a 2.5" as well.

    Helpful (0)
    Post Your Question
    8 More Questions
    I have the Eibach Sportline Lowering springs. My car sits low. Will I have clearing issue (speed bumps)? I was told that some headers sit lower then others. 1 answer
    Do they work wit the Borla ATAK 3in Catback? 1 answer
    Will these bolt right up with a ford performance x-pipe? 1 answer
    Can I pair this with the MBRP street catback? 1 answer
    will this exact setup bolt right up to the corsa extreme catback? 1 answer
    Will these headers fit my 2015 mustang GT that already has a flowmaster x-pipe resonator delete and flowmaster outlaw series axle back installed? 1 answer
    Will this bolt up to my stock exhaust without and issues and if not will any of them? 1 answer
    Can you run this long tube header system without a tune? 1 answer

    People Who Bought This Item Also Bought

    Customer Reviews (11) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$500-$1000

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

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      September 22, 2018

      Little tricky

      These stainless power headers really put down some power make about the same power that an upgraded manifold puts probably about a day to a 2 day install depending on who does it fits perfect


      Year: 2017 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Afternoon

      May 17, 2018

      Surprised by the outcome. Great piece

      These headers installed on my 2018 without any issues and the quality surprised me for a "cheaper" header on the market. I was fearful of the off road setup as I had not actually heard a car in person with the setup, however, it is manageable with these headers and resonator delete. I would imagine that paired with a straight through muffler or muffler delete, that it would be incredibly too loud.


      Year: 2018 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      April 02, 2018


      It was great. I love the instant power gains and it just makes the car run better.


      Year: 2015 Submodel: GT

      Helpful (3)

    • 4/5

      Installation Time: Full Day

      March 26, 2018

      Long Tube Headers

      Good quality headers, paid a local shop for the install it was pricey but worth it. I paired these headers with ford performance x-pipe and Roush axle-backs and it is insanely loud. Drone is really bad around 2-2.5k rpm. I can live with it, but probably will have to switch to a different setup, maybe an h-pipe or different axle-backs or a catback system, but for now I am happy with how the car sounds.


      Year: 2015 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      October 15, 2017


      Just a great product and loved that bottle opener that came with em .


      Year: 2016 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      October 03, 2017

      25HP GAIN!!

      Put these on in a jiffy. Maybe less than 4 hours of actual work time (had friends with me so we joked around for a while during the install) My tuner bumped the power up by 25 horses after these were installed. They sound great! Car is so loud now! Absolutely worth the price


      Year: 2015 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Full Day

      June 20, 2017

      SP Headers

      Awesome power and sound. Quality product with perfect fitment. Worth every penny


      Year: 2016 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Afternoon

      June 08, 2017

      2015 GT header

      Great way to get some more power. Took about 5 hours total to install. Does add quite a bit of noise but I'll live with tit


      Year: 2015 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Full Day

      May 25, 2017

      Great product!

      I have this long tube hearders installed in my garage with jack stands it took all day but the sound is amazing! The quality is perfect my combination is stainless power catless long tube hearders, ford racing x pipe and roush axel back is loud! Really loud!


      Year: 2015 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Full Day

      November 22, 2016

      Define power

      The cold starts are just simply breathtaking. An absolute must have for anyone wanting power and aggression.


      Year: 2015 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Full Day

      November 21, 2016

      Great Product

      I installed these headers on jack stands in my buddy's garage in one day. It was tedious, but it is possible if you don't have access to a lift. These headers fit great, there were only a few bolts that were hard to get to. They went on easier than the manifolds came off. I paired them with Stainless works 3in cat back with H pipe and it sounds amazing. However, it is LOUD when you get on it. Idle and cruising aren't that loud. Drone is actually better than when I just had the cat back by itself. The power increase is definitely worth it. I'm running a Lund tune and it pulls much harder. I've got to invest in better tires now. Lol. I was slightly worried with these being Stainless power the quality wouldn't be so good, but they were just as good of quality as my cat back.


      Year: 2016 Submodel: GT

      Helpful (5)

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