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

Market Price $2,192.36 You Save 12% ($252.22)
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  • Item 101825

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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 Tube Finish: Natural
    Type Mid Pipe Required: Shorty - Included Fitment: 2011-2014 GT Mustangs

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

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    Questions & Answers (11)

    5 Top Rated Questions

    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)

    Will I be able to use the Flowmaster Outlaw AxelBacks with this setup?

    • The MP Concepts GT350 Style Front Bumper Kit would be compatible with the Stainless Works 1-7/8 in. Long Tube Headers & High Flow Catted X-Pipe Kit.

    Helpful (0)

    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?

    • The Stainless Works Long Tube Headers and High Flow Catted X-Pipe Kit are designed as an off road product. We cannot say if these would or would not pass Texas emissions, as we do not know all of the laws and regulations. The best bet would be to check with a local emissions inspector.

    Helpful (0)
    Post Your Question
    6 More Questions
    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

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    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 (6)

    • 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 (5)

    • 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 (7)

    • 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 (13)

    • 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 (7)

    • 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 (10)

    • 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 (7)

    • 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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