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Kooks Super Street Shorty Headers 1-7/8 in. (11-14 GT, BOSS)

Market Price $766.80 You Save 10% ($76.68)
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  • Item 65535
  • MPN# 11401400

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Features & Details

  • 10-12 Horsepower Increase Along with Increased Torque
  • 50% Lighter Than the Factory Manifold
  • Shorty Header Design
  • Free Flowing 1-7/8" Mandrel-Bent Tubing
  • 304 Stainless Steel Construction
  • TIG Welded for Strength
  • Fits 2011-2014 GT and BOSS Mustangs
More Horsepower and Torque. Replace those heavy, restrictive cast iron stock exhaust manifolds with a set of Kooks Super Street Shorty Headers. This upgrade will increase the horsepower of your 5.0L Coyote Powered Mustang by approximately 10-12 horsepower. Additionally, these Kooks headers are approximately 50% lighter than stock.

Quality Construction. Kooks Super Street Shorty headers are manufactured from 1-7/8" mandrel bent 304 stainless steel tubing with 3" collectors for superior exhaust flow and optimal performance. These Kook shorty headers feature a one piece 3/8" header flanges that are TIG welded for extra strength and a direct OEM style fit.

Application. These Kooks Super Street Shorty Headers are designed to bolt straight up in the stock location to the stock Mid-Pipe without any modifications required on the 2011 to 2014 5.0L GT and BOSS Mustangs for improved exhaust flow and sound.

Fitment: 2011 2012 2013 2014 Details

What's in the Box
  • (1) Driver side header
  • (1) Passenger side header
Installation Info
Tech Specs
Header Specifications
Header Type: Shorty Finish : Natural
Type Mid Pipe Required: Standard Length Fitment: 2011-2014 5.0 GT & BOSS Mustangs
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • GT - 11, 12, 13, 14

People Who Bought This Item Also Bought

Most Helpful Reviews


Headers look great and sound great. I have a 66 convertible with a coyote in it.

Helpful (1)

Tight Fit

I got these headers and knew going into it that it would be tough, did not realize how tough it would be though. It was a serious task to get to the top bolt on the starter, and they are really tight for ...

Read More
Helpful (5)

Overall Rating 5 out of 5 stars
Read All 5 Reviews

Customer Photos (4) Submit Your Photo

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5 Questions / 6 Answers

Ask a Question

so is this a good fit for ford racing x pipe and borla s type axle back ?


Helpful (0)
  • Hey Jesus This should bolt on to your ford racing pipe without a problem. With Shorty headers you get a little more wiggle room in terms of mid pipe fitment than you would with long tubes.


Would this sound throtty with borla s type and Ford racing x pipe ?


Helpful (0)
  • Hey Jesus, Sound is some what relative when it comes to exhausts. One mans loud is another's perfect and so forth. What is true is that the x-pipe will make any system gain a throatier sound, with the kooks more free flowing manifolds it should amplify that very noticeably.


Will this fit my magnaflow cat back exhaust?


Helpful (0)
  • Hi, These shorty headers are designed to bolt straight up in the stock location and use the stock Mid-Pipe and can be used with a most cat-backs.

    Chris J

Are these CARB legal?


Helpful (0)
  • The Kooks Super Street Shorty Headers 1-7/8 in. (11-14 GT, BOSS) will not be CARB legal.


do i need a new tune ?


Helpful (0)
  • You dont need a tune, but for proper performance results a custom tune help to increase your HP & TQ


Show 1 more answer

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Customer Reviews (5) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Weekend

  • Performance Gain 4.8 4.8
  • Fit 5 5

  • 5/5

    Installation Time: Afternoon

    October 30, 2016


    Headers look great and sound great. I have a 66 convertible with a coyote in it.


    Year: Pre-79 Submodel: Other

    Helpful (1)

  • 5/5

    Installation Time: Weekend

    June 19, 2013

    Tight Fit

    I got these headers and knew going into it that it would be tough, did not realize how tough it would be though. It was a serious task to get to the top bolt on the starter, and they are really tight for being such a small bolt, then getting the front two bolts on the passenger side engine mount became a chore to remove because of the ground wire on the upper one and the one wiring harness. After getting that all out of the way and removing the steering linkage I just had to lift the engine up. Removing the headers was fairly easy, and removing the studs was fine as long as you have an E8 inverted torx socket. The instructions I got with my headers said to put a few of the bottom bolts in and hang the header on it, that didn't work for me at all. I put the top 4 in, pressed the header up into it then started the easiest to reach bottom bolt. Also I had to clean the holes up before putting the new bolts in, mine was the fine thread set and it was a M10X1,25 tap. I would highly recommend using a lift if you have access to one, this job really sucked to do laying under the car between a jack and jack stands.


    Year: 2012 Submodel: GT

    Helpful (5)

  • 5/5

    Installation Time: Weekend

    July 24, 2015

    Kooks Headers

    Well after a full weekend I got my car back with these headers, from what I was told.. this wasn't an easy install. Alot can be done with 1 person, but will require 2 people at some point. However perfect fitment, the supplied gaskets seemed a little on the cheap side but they had to be used. The headers have very good quality, and exhaust flow. Sound overall the exhaust note is deeper, swifter and just has an unique sound. My car breathes so good now sounds like a turbo is under the hood! When on throttle, the response is very better, and you can feel the car pulling harder but smoother. I have the Roush Axle backs and they toned down the rasp, but is still loud with way better tone. At WOT the car still screams so no worry there. Only recommendation is to go back and tighten the head bolts, usually new bolts will back out a little bit with vibration.. but you'll be able to tighten up, up top.


    Year: 2013 Submodel: GT HOUSTON TX

    Helpful (1)

  • 5/5

    Installation Time: Weekend

    March 09, 2014


    I installed these in my garage with rear wheels on ramps and the front on jack stands. I won't lie, this job was hard! It took about 3 days but it was really worth it. I definitely recommend dropping the K-member as it will make the starter and all the header bolts easy to access except the front passenger side stud. Like another customer mentioned get an e8 torx socket and removing the studs will be easy. My 2013 GT with 22000 miles has been thru 2 winters here in Germany so my exhaust is pretty rusted. I snapped one of the catalytic converter studs so be prepared to knock the studs out and replace them if this happens to you. I also recommend replacing your stock motor mounts if you are going to do this job since you will either have the k-member out or engine raised either way. After the first start up I knew I made a great choice. I thought my Roush axlebacks sounded great before, but now they are a little louder and much deeper! I can definitely feel the seat of the pants hp/tq gain from these headers!


    Year: 2013 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Weekend

    August 25, 2013

    Kooks super shorty street headers

    Awesome awesome product. Took a weekend to install but could be done faster as I took my time. You well feel the power increase, and the fitment is just perfect. One note thought be carefull of the ac hose on the passenger side as its close to the factory header stud


    Year: 2012 Submodel: GT canada

    Helpful (1)

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