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Stainless Works 1-7/8 in. Long Tube Headers & High Flow Catted X-Pipe Kit (11-14 GT)

Item 101825
Market Price $2,192.36 You Save 12% ($252.22)
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    Features, Video & Details

    • Increases Horsepower and Torque
    • Raspy Race Car Growl
    • Long Tube Header Design
    • Free Flowing 1-7/8" Mandrel-Bent Tubing
    • Stainless Steel Construction - Natural Finish
    • Matching High-Flow Catted Shorty X-Pipe Included
    • Intended for Off-Road, Track Use Only
    • Designed and Manufactured in the USA
    • Fits 2011-2014 GT Mustangs

    Review & Installation Video

    Review & Install Video

    More Horsepower And Torque. Improve the performance of your 5.0L coyote powered Mustang throughout the entire RPM range with a Stainless Works Long Tube Header and Catted Shorty X-Pipe combo kit from AmericanMuscle. This Stainless Works Header and X-Pipe kit will greatly improve your 5.0L Mustangs exhaust flow over the restrictive factory manifolds and Mid Pipe 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.

    Race Car Growl. The included Stainless Works 3" diameter 304 stainless steel high-flow catted X-Pipe not only improves exhaust flow to increase power, but it also adds a crisp raspy, race car growl to the sound of your Mustangs exhaust with its modern merged "X" crossover design.

    Recommended Upgrade. To realize the full power potential that this Long Tube Header and Catted Shorty X-Pipe combo kit has to offer, AmericanMuscle highly recommends a Bama custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

    Application. This Stainless Works Long Tube Header and Catted X-Pipe combo kit is specifically designed to fit the 2011 to 2014 GT Mustangs equipped with the 32-valve DOHC coyote 5.0L V8 engine.

    Technical notes. This Stainless Works product may not be legal for use on pollution controlled motor vehicles; intended for off road use only.

    Fitment: 2011 2012 2013 2014 Details


    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • Long Tube Headers
    • Catted X-Pipe
    Installation Info
    Tech Specs
    Header Specifications
    Header Type:Long TubeFinish:Natural
    Type Mid Pipe Required:Shorty - IncludedFitment:2011-2014 GT Mustangs

    Mid Pipe Specifications
    Style Mid Pipe: Shorty "X"Type Headers Required:Long Tube - Included
    Piping Material:Stainless SteelPiping Size:3"
    Catalytic Converter:"Yes"Fitment:2011-2014 GT Mustangs
    Will it fit my Mustang?

      Customer Photos (2) Submit Your Photo

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        Questions & Answers (13)

        5 Top Rated Questions

        Will the headers fit on a bbk x pipe?

        • This will already come with an X-pipe included which is needed to run this setup.

        Helpful (2)

        I know there is no carb stamp but if they don't do a visual inspection will it still pass emissions testing

        • This is not CARB legal and will not pass emissions testing in California.

        Helpful (0)

        Will I need to purchase o2 extensions for this kit?

        • This kit comes with an o2 extension and all hardware needed for the install!

        Helpful (0)

        Would these pass emissions in Pennsylvania?

        • This Stainless Works 1-7/8 in. Long Tube Headers & High Flow Catted X-Pipe Kit may not be legal for use on pollution controlled motor vehicles as it is designed for off-road/track use only. We would recommend speaking with local authorities regarding specific emissions regulations in your area.

        Helpful (0)

        Installing these. Can I still use my stock front sway bar?

        • This Stainless Works Long Tube Headers & High Flow Catted X-Pipe will still allow the use for the factory front sway bar.

        Helpful (0)
        Post Your Question
        8 More Questions
        Will I be able to use the Flowmaster Outlaw AxelBacks with this setup? 1 answer
        I'm looking at putting these on my daily, the description says off-road use in most cases even though you'd still have cats on, so my question is after a tune would these be able to pass inspection in say Texas? 1 answer
        If I were to purchase would my car throw a check engine light? If I don't get the Bama power flash tuner? 1 answer
        I have Roush Axlebacks on my Mustang, the rest of the exhaust system is stock. Would I have to cut anything or if I just give the pipes and headers to a shop would they be able to put them on without problem? 1 answer
        What's is the difference between this one and the stainless power ones (Item 390793-A 390793-A)? 1 answer
        Will these hook up to a flowmaster outlaw catback exhaust? 2 answers
        How will these work with a VMP stage 2 super charge? For some reason it won't let me pick a sub model... 2013 GT 1 answer
        Just wondering does this system also fit the 12-13 Boss? I would assume it would seeing as how they are both 5.0's and of the same design. Just curious if these do not then what headers do fit the Boss 302? Also looking at catbacks as well I see models for the GT but not the Boss is this the same case as well. Thanks for the help. 1 answer

          Customer Reviews (11) Write a Review

          Overall Rating 4.9

          out of 5 stars

          Installation Time:Full Day

          Installation Cost:$250-$500

          • Loudness / Volume 4.818182 4.8
          • Exhaust Note 4.909091 4.9
          • Fit & Finish 4.909091 4.9
          • Bang For Your Buck 4.545455 4.5

          • 5/5

            Installation Time: Afternoon

            November 27, 2017

            Awesome sound

            Really woke up the car , highly recommend had zero fitment issues. These paired with roush mufflers are amazing


            Year: 2011 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Full Day

            September 12, 2017


            These long tubes make the car sound insane! I have it paired to the Borla Atak and the car screams! There's no drone cruising around town or even on the highway at 70-75. It's only loud when you crack the gas. The car pulls much harder now (thank you to Bama with the tune). They are worth every penny. The install is a pain, didn't do it myself and paid for it but I know it's in there and done properly. Shop said the fit and finish on them is incredible so definitely worth the money for power as well as fit.


            Year: 2014 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $500-$1000

            May 30, 2017

            Great product

            Great fit and finish, you get what you pay for. The sound with these is great. Power gains were noticable


            Year: 2014 Submodel: GT

            Helpful (9)

          • 5/5

            Installation Time: Full Day

            April 25, 2017

            Great headers overall

            If you want to avoid the possibility of dealing with any fitment issues, you can't go wrong with spending a few extra bucks on these headers. The x-pipe it comes with bolts on perfectly to the stock exhaust that connects to your axle-back/mufflers. If you want to keep your cats, there aren't many options on the market right now; this kit does an awesome job of letting me pass inspection while not restricting airflow. I felt a noticeable gain in power in 2nd and 3rd gear especially. They're so incredibly loud when you get on it and I personally love it. At cruising speed it's like all you have is an axleback, no drone whatsoever. Install was not easy on jack stands, took a full day, but most of the time was spent removing the old headers. I couldn't get the downpipe separated from the stock headers; spent about 2 hours working on the bolts and then decided to cut the old exhaust at the h-pipe and just pull the entire header/downpipe off at once (this is a good option if you have rusty bolts and don't need your old exhaust, there's plenty of space in the engine bay to wiggle it out in one piece). Overall, well worth it in my opinion, but definitely not something I'd want to do again if I wasn't getting paid and didn't have a lift! As far as sound goes, I have it paired with roush axlebacks and it sort of keeps the raspy roush tone, but much much angrier :)


            Year: 2014 Submodel: GT

            Helpful (15)

          • 5/5

            Installation Time: Full Day

            February 24, 2017

            stainless works headers

            my mustang sounds incredible noticed the front end lift more on the first hit of the gas car is screaming!!!! cant wait for track to open to get a time slip


            Year: 2013 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Full Day

            February 15, 2017

            Happy with my purchase

            They made a noticeable difference in power and love the way that my car sounds now .


            Year: 2012 Submodel: GT

            Helpful (11)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $100-$250

            September 29, 2016

            Stainless Works Long Tube Header 2013 Mustang GT

            I had them installed by a professional. I could notice the added HP and torque, how much don't know but it's noticeable. The sound is deep and rumbly exactly what I was looking for. All in all a good product and definitely worth it.


            Year: 2013 Submodel: GT

            Helpful (7)

          • 4/5

            Installation Time: Full Day

            May 12, 2016

            Loud and pricey

            My 2012 had Roush axlebacks on it, holy s*** is it loud now. As far as performance, i cant say it justifies $1600, but the sound, thats worth a good amount. Install wasnt for beginners, pay somebody if u dont have a lift. Necks are snapping when i drive by, that part is fun. If its sound you want buy it, if it's power you want, keep saving for the supercharger.


            Year: 2012 Submodel: GT

            Helpful (8)

          • 5/5

            Installation Time: Full Day

            December 23, 2015

            perfect fit, wicked sound

            Took six hours on lift with an extra hand, fit, finish and sound are spot on. Tons of clearance around steering, great ground clearance as well. Instructions were useless, and the o2 extension is garbage and won't make a connection, so I got a cel. Would recommend buying a new o2 sensor,from the raptor that is 18 inches long. But overall product is awesome!


            Year: 2014 Submodel: GT indian trail nc

            Helpful (9)

          • 5/5

            Installation Time: Weekend

            August 30, 2015

            Best headers out there

            Very loud! Nice hp gains. Definitely get a lot of head turning while I'm driving down the road. Nothing compares to stainless works


            Year: 2014 Submodel: GT Crown Point, IN

            Helpful (5)

          • 5/5

            Installation Time: Full Day

            June 09, 2014

            Best investment!

            The installation was rough, took almost a full 24 hours of work. High recommend following the instructions provided by Stainless Works, but be prepared they are very vague and we ran into some minor issues. Absolutely worth the work! The car just sounds unreal! I can definitely feel a big difference in HP gains, also some minor MPG gains as well.


            Year: 2013 Submodel: GT

            Helpful (5)

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