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

Item 65535
Market Price $861.36 You Save 12% ($99.09)
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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

    MPN# 11401400

    CA Residents: WARNING: Cancer and Reproductive Harm -

    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?

      Customer Photos (5) Submit Your Photo

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        Questions & Answers (16)

        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 (2)

        Will these fit on my stock cats? I have a borla atak catback system! thanks

        • The Kooks 1-7/8 in. Super Street Shorty Headers will work with your stock mid pipe and catalytic converters.

        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)

        are these equal length primarys, I was also looking at Magnaflow 1-3/4 in. Ceramic Shorty Headers and they look more like equal length primarys

        • The Kooks 1-7/8 in. Super Street Shorty Headers do not have equal length primary tubing.

        Helpful (0)

        Hello, will these headers hook up to the factory CATs to make them smog legal?

        Post Your Question
        10 More Questions
        Will these work with the pypes off-road xpipe on the 14 mustang gt 1 answer
        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 1 answer
        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 1 answer
        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
        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

          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 (4)

          • 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 (3)

          • 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 (9)

          • 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 (11)

          • 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 (9)

          • 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 (14)

          • 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 (9)

          • 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 (8)

          • 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 (9)

          • 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 (6)

          • 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 (14)