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Kooks 1-7/8 in. Super Street Shorty Headers (11-14 GT; 12-13 BOSS 302)

Market Price $813.99 You Save 12% ($94.19)
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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

    CA Residents: Warning: California's Proposition 65

    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?

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    Questions & Answers (14)

    5 Top Rated Questions

    Will these fit up with pypes off road h pipe with the cat delete option and if so do I need a custom tune. will I lose torque and gain hp or vice versa?

    • These headers will work with that mid-pipe and a tune is highly recommended. As far as the gains you will see all around gains.

    Helpful (1)

    Are these headers tune required and will they fit my car? I have jba off road h pipe

    • A tune is highly recommended with the Kooks Super Street Shorty Headers. These headers are designed to bolt up to the factory H-Pipe. It may not be a direct bolt on with the JBA mid-pipe.

    Helpful (1)

    Will these work with the pypes off-road xpipe on the 14 mustang gt

    • Unfortunately, these headers are designed to be a bolt-on install with the factory mid pipe and will not be a direct bolt-on installationwith the Pypes x-pipe. 

    Helpful (0)

    are these 50 state and will i need to retune my car if i have a whipple 2.9 stage 3 set up. if these are no 50 state will the bbq work just as good with same setup and would the bbq shorty need a retune

    • The Kooks 1-7/8 in. Super Street Shorty Headers will not carry a CARB EO number, making these unable to pass in states that have adopted California Emissions. The BBK 1-3/4 in. Tuned Length Shorty Headers do carry the CARB EO number necessary to pass California emissions. The BBK headers will have a smaller diameter primary tube, making these slightly more restrictive on a higher horsepower car like yours with the 2.9 Whipple, when compared to the larger Kooks primaries.

    Helpful (0)

    hi guys, a question for you,looking at 2 of your shorty headers,the kooks ceramic 1 7/8 and the bbk 1 3/4, now is there any power gains or lose using the 1 7/8 kooks over the 1 3/4 bbk's ,do you loose TQ with the 1 7/8 as to using the bbk's 1 3/4.i will be using the stock cat back for now with different axel back. thx for viewing my questions and keep up the great work ... kena

    • If you are going to use the Kooks 1-7/8 in. Super Street Shorty Headers I would recommend some kind of forced induction. (Nitrous, supercharger, etc.) if not there will be a smaller power gain due to less back pressure.

    Helpful (0)
    Post Your Question
    9 More Questions
    Will this setup work fitment-wise if I purchase this product? Kooks shorty headers, stock cats, pypes o/r h pipe, Roush axle backs 1 answer
    Will these fit on my stock cats? I have a borla atak catback system! thanks 1 answer
    Hello AM, Will the shorty headers fit to a KOOKS H-pipe? I can only find KOOKS h-pipes with long tube headers required. Thanks from The Netherlands 1 answer
    looking at kooks shorty headers for 2012 boss mustang. I would like to confirm fitment to the stock boss exhaust system. 1 answer
    so is this a good fit for ford racing x pipe and borla s type axle back ? 1 answer
    Would this sound throtty with borla s type and Ford racing x pipe ? 1 answer
    Will this fit my magnaflow cat back exhaust? 1 answer
    Are these CARB legal? 1 answer
    do i need a new tune ? 2 answers

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    Customer Reviews (11) Write a Review

    Overall Rating 4.7

    out of 5 stars

    Installation Time:Full Day

    Installation Cost:$250-$500

    • Performance Gain 4.636364 4.6
    • Fit 4.909091 4.9

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      October 30, 2018

      Smooth booster

      Better than stock. Has a smoother throttle response with a bottom end boost. Exhaust sounds smoother and lower but was told it would get louder over time. My setup is borla s type with basani catted x pipe and 85 millimeter bbk throttle body. I also have k@n 69 typhoon cai with bama tune. My 2 w6v3 12s powered by slash amp makes the commute even nicer. 2014 gt premium with 6000 miles. I drive truck otr so car isn't driven much.


      Year: 2014 Submodel: GT

      Helpful (0)

    • 3/5

      Installation Time: Full Day

      June 20, 2018

      Good power , Great Sound

      Great fit. Good quality. Can feel the extra power mid range to redline. Sounds bada$$.


      Year: 2011 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Full Day

      May 23, 2018

      Definitely worth it

      Install took 9 hours with lift and Jack Stands, pretty straight foward and fitment is perfect. Dropping the K member is not required at all. As for power you can feel the torque and horsepower increase in the low end. Thats what i was goinf for since i have the Boss 302 Manifold and as for sound it gives it a smooth toned sound which is just perfect.


      Year: 2012 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Full Day

      May 04, 2018

      Shorties ... vs Long tube

      After a lot of research I went with the Kooks shorties ... and having to listen to everyone tell me that they were useless and to only buy long tubes. Well all my research never showed that long tubes gave a huge amount back. The shorties worked wonders on my car ... I love the grunt they give down low and mid range ... and up top they are phenomenal. I am really happy at how they worked out.


      Year: 2014 Submodel: GT

      Helpful (4)

    • 4/5

      Installation Time: Weekend

      August 16, 2017

      Kooks to Boss

      Patience is a virtue. Fit was good and not a job to hurry on. Must be very careful with aluminum heads. Tightening sequence must be repeated 4 or 5 times to evenly spread supplied gasket and to insure it is tight. When complete all fitment was good. Also suggest cleaning out interior pipes on headers as there was much steel filings in them.


      Year: 2012 Submodel: Boss

      Helpful (5)

    • 5/5

      Installation Time: Less than 1 Hour

      August 15, 2017

      Kooks shorty headers and torque

      Have road raced with longbtube headers and X pipe for 2 years. Went to these shortys and an H pipe to increase torque and reduce weight. Dropped 13 lbs over prior set up and picked up 21 ft lbs of torque after tuning. No loss of HP. Added benefit is that the exhaust system is now even with frame rails instead of below.


      Year: 2012 Submodel: Boss

      Helpful (9)

    • 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 (6)

    • 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 (4)

    • 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 (7)

    • 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 (5)

    • 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 (12)

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