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

Item 65535
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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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 -


      Customer Reviews (12)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 12 customers

      Installation Time: Full Day

      Installation Cost: $250-$500

      • February 24, 2020

        5 2014 GT - Scott23

        Great sound and torque.

        I have the boss intake so I lost some low in torque and these headers really helped out. Sound is great . It’s a lot deeper tone. The car really breathes now

        Helpful (1)
      • October 30, 2018

        5 2014 GT - CharlesH Installation Time: Shop Install Installation Cost: $250-$500

        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.

        Helpful (5)
      • June 20, 2018

        3 2011 GT - JohnM Installation Time: Full Day

        Good power , Great Sound

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

        Helpful (4)
      • May 23, 2018

        5 2012 GT - White5oh Installation Time: Full Day

        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.

        Helpful (11)
      • May 04, 2018

        5 2014 GT - WodzR Installation Time: Full Day

        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.

        Helpful (12)
      • August 16, 2017

        4 2012 Boss - Fastlane Installation Time: Weekend

        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.

        Helpful (10)
      • August 15, 2017

        5 2012 Boss - BOSSLS545 Installation Time: Less than 1 Hour

        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.

        Helpful (16)
      • October 30, 2016

        5 Pre-79 Other - Buddy Installation Time: Afternoon


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

        Helpful (12)
      • July 24, 2015

        5 2013 GT - JAY Installation Time: Weekend

        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.

        Helpful (9)
      • March 09, 2014

        5 2013 GT - 13GTBREMBO Installation Time: Weekend


        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!

        Helpful (9)

      Questions & Answers (17 answers)

      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)

      I have a coyote swap truck, if these headers don't fit, can I return them hassle free? I've had coyote swap headers and none seem to fit in the longtube world and neither will stock gt manifolds. These look cleaner in regards to fabrication.

      • As these are not intended to be used on models other than Mustangs listed, if they are not in brand new condition they cannot be returned.

      Helpful (0)

      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)
      Post Your Question
      10 More Questions
      Hello, will these headers hook up to the factory CATs to make them smog legal? 0 answer
      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

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Driver side header
      • (1) Passenger side header

      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