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Stainless Works Long Tube Headers and High Flow Catted X-Pipe Kit (11-14 GT)

Market Price $1,835.00 You Save 5% ($91.75)
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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

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?
  • GT - 11, 12, 13, 14

People Who Bought This Item Also Bought

Most Helpful Reviews

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 ...

Read More
Helpful (1)

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

Helpful (1)

Overall Rating 4.9 out of 5 stars
Read All 7 Reviews

Customer Photos

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6 Questions / 7 Answers

Ask a Question

If I were to purchase would my car throw a check engine light? If I don't get the Bama power flash tuner?


Helpful (0)
  • Your car will throw a check engine light as you will be changing the size of the headers, the flow rate and the location of the O2 bungs. You will need to have Bama or another tuning specialist retune your vehicle to accommodate the new changes in your exhaust setup.


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?


Helpful (0)
  • You should not need to cut anything in order to install these headers and x-pipe. They will clamp on to the factory over axle pipe. We do recommend getting a tune for this set up. If you already have a Bama tuner, you can simply request a new tune. Though, if you do not, you may be interested in the Bama X4/SF4 Power Flash Tuner w/ 2 Custom Tunes (11-14 GT, 12-13 BOSS), item # 101200G11, ( The tunes will adjust the car to the increased airflow, thus creating more power.


What's is the difference between this one and the stainless power ones (Item 390793-A 390793-A)?


Helpful (0)
  • The only difference between the two kits would be that item # 101825 comes with a natural finish while item # 390793-A is simply a stainless steel construction. They are both made from 1-7/8" mandrel bent 302 stainless steel tubing with a 3/8" thick header flange. Both also include an x-pipe. Though, Stainless Power Long Tube Headers w/Factory Connect gives you the option of having an off-road or catted x-pipe while the other does not.


Will these hook up to a flowmaster outlaw catback exhaust?


Helpful (0)
  • The Flowmaster Outlaw Cat-Back Exhaust w/ X-Pipe - Stainless Steel (13-14 GT), item # 18444, ( comes with an X-Pipe. In order to make the Headers and this Cat-Back work together, you can only use one X-Pipe. Also, they will not be a direct bolt on to each other. This installation will require you to do some modifications. We recommend professional installation of these parts.


Show 1 more answer

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


Helpful (0)
  • Yes, these headers will fit with a supercharger as the supercharger does not modify the exhaust. They will require a re-tune.


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.


Helpful (0)
  • These headers will work with the Boss 302 model as well. The only problem you will face is the Boss 302 is equipped with the specific H pipe with that will have the cut outs that come out the side of the car as well as different diameter piping. You will either need to have that mid pipe adapted to fit the headers or purchase the matching mid pipe and have it mounted to the car.


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Customer Reviews (7) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume 4.714286 4.7
  • Exhaust Note 4.857143 4.9
  • Fit & Finish 4.857143 4.9
  • Bang For Your Buck 4.428571 4.4

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

  • 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 (1)

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