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Kooks Long Tube Headers 1-7/8 in. (11-14 GT)

Market Price $1,201.56 You Save 10% ($120.16)
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  • Item 65511
  • MPN# 11412400

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Features, Videos & Details

  • Increases RWHP and Torque
  • Long Tube Header Design
  • Free Flowing 1-7/8" Mandrel-Bent Tubing
  • 304 Stainless Steel Construction
  • TIG Welded for Strength
  • Fits 2011-2014 GT Mustangs

Review & Installation Video

More Horsepower and Torque. A set of Kooks Long Tube Headers will greatly improve the performance of your 5.0L Coyote Mustang. Kooks Headers feature an integrated venturi style collector that increases exhaust scavenging, and reduces turbulence to improve your 5.0's exhaust flow over the restrictive factory manifolds, boosting your Pony's horsepower and torque numbers.

Quality Construction. Kooks Long Tube Exhaust headers are manufactured from 1-7/8" mandrel bent 304 stainless steel tubing for superior airflow. These headers are TIG welded and feature a leak-free ball flange design for optimal performance and a better than OEM fit.

Recommended Upgrade. To realize the full power potential that these Long Tube Headers have to offer, AmericanMuscle recommends a custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

Application. These Kooks Long Tube Headers are designed to fit the 2011-2014 5.0L GT Mustangs. Kooks long tube headers require the use of a Kooks shorty midpipe in order to be installed properly (see drop down option above).

Technical notes. Not 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
  • (1) Driver side header
  • (1) Passenger side header
  • (2) Gaskets
  • (16) Small bolts
  • (8) Flat washers
  • (4) Long bolts
  • (4) Nuts
Installation Info
About The Brand

About Kooks


Tech Specs
Header Specifications
Header Type: Long Tube Finish : Natural
Type Mid Pipe Required: Shorty Fitment: 2011-2014 5.0 GT Mustangs
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • GT - 11, 12, 13, 14

Most Helpful Reviews

Kooks !

Great product ! Really recommend kooks. Added great power to the mustang, sounds great when paired up with other kooks x pipe and cat back exhaust.

Helpful (1)

Great product

Put a set of these on my 2014 Mustang, and love the sound! used and offroad X-pipe. an man does she rumble, took the weekend to install them, they were a little bit of a pain in the butt. But definitely ...

Read More
Helpful (1)

Overall Rating 4.7 out of 5 stars
Read All 17 Reviews

Customer Photos (3) Submit Your Photo

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10 Questions / 7 Answers

Ask a Question

Do these require a O2 extension harness, most other longtubes seem to come with them, I wanna be prepared for the install for my 2014 mustang gt. 1-7/8 IN. Combined with off road X. The kooks didn't come with any


  • The headers for the 11-14 Mustang GT's do not require O2 extensions.

    Kooks Headers

    Helpful (1)

Show 1 more answer Answer This Question

Can you order these with an H-Pipe (either off road or catted) instead of an X-Pipe for the '13 and '14 Mustang GT? I prefer the sound of an H-Pipe over an X and is a major selling point for me.


  • You can order these headers with the Kooks Green catted H-Pipe which you can find right here ( to keep that sound you would prefer.


    Helpful (0)

Has Kooks, or anyone else, figured out how to use LTH setups within throwing a CEL? If so, what is it? I know CoolTech had a system in 2013 but it was never put into production. Colorado emissions are strict and these would be a pain to put on and take off for testing. Thanks


  • Long tube headers will throw a CEL code because the cars computer codes are set up for the stock short style headers. They will throw the CEL without a rewritten code because the car has to be tuned to accommodate the new air flow rate. All of the long tube headers that we offer on our site, we recommend that you have a new tune written to make sure that you will not throw a CEL code.


    Helpful (0)

Will i lose the side exhaust if i buy the mid pipe in the drop down options?


  • You will lose the side exhaust if you had in the needed mid pipe. The side exhaust used a different style mid pipe, which would need to be replaced in order to install these headers properly.


    Helpful (0)

will this fit with the Flowmaster outlaw exhaust system?


  • The Kooks Long Tube Headers 1-7/8 in. are designed to work with either the Kooks High Flow Catted X-pipe (11-14 GT w/ Long Tube Headers), item # 65504, ( or the Kooks Off-road X-pipe (11-14 GT w/ Long Tube Headers), item # 65505, ( If you have any of the Flowmaster Cat-Back Systems, they will not work with these Headers and Mid-Pipes. This is because the Cat-Backs are designed to fit either aftermarket shorty headers or the factory manifolds. If you have any of the Flowmaster Axle-Back Exhausts, you will not have any issues when installing the Headers and Mid-Pipe.


    Helpful (0)

Will these lt headers and matching x pipe fit up with flow masters outlaw axle backs or will there be more pieces needed


  • The Kooks Long Tube Headers 1-7/8 in. (11-14 GT) with the Kooks x-pipe will work with your Flowmaster outlaw axle backs.


    Helpful (0)

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Customer Reviews (17) Write a Review

Overall Rating 4.7

out of 5 stars

Installation Time:Weekend

Installation Cost:$500-$1000

  • Performance Gain 4.875 4.9
  • Fit 4.375 4.4

  • 5/5

    June 09, 2016

    Kooks !

    Great product ! Really recommend kooks. Added great power to the mustang, sounds great when paired up with other kooks x pipe and cat back exhaust.


    Year: 2013 Submodel: GT

    Helpful (1)

  • 4/5

    Installation Time: Afternoon

    February 01, 2016

    getting better

    before I bought this product I was thinking how make perfect sound to my 2013 gt one of my friends told me to get the KooKs Long Tube 1.7/8 and I was so happy when I saw the result : 1- perfect and loud sound. 2- A little of power.


    Year: 2013 Submodel: GT Mobile,AL

    Helpful (1)

  • 5/5

    Installation Time: Weekend

    October 19, 2015

    Great product

    Put a set of these on my 2014 Mustang, and love the sound! used and offroad X-pipe. an man does she rumble, took the weekend to install them, they were a little bit of a pain in the butt. But definitely all worth it!


    Year: 2014 Submodel: GT Odessa, Texas

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    September 23, 2015

    Good product I loved it

    I loved the product. Took me a little less then 7 hours. Had to lift the motor an push over a little to get driver side in but after that it was like cake. Definitely fell the difference. It drives a whole lot smoother. I would recommend it.


    Year: 2013 Submodel: GT Olton tx

    Helpful (1)

  • 5/5

    April 23, 2011

    Long Tube Headers

    These headers have great fitment. Quality is second to none. At the lowest point of the header barely hangs lower than the floor pan (for those that are lowered a little or a lot. Great power increase

    Daniel A.

    Year: 2011 Submodel: GT

    Helpful (19)

  • 4/5

    Installation Time: Weekend

    August 17, 2012

    Awesome sound

    I put these on my 13 Boss along with the H-pipe and removed the baffles and the car sounds mean, very mean. Only beef with them is they are a pain to install. Had stock parts out in 4 hours took another 20 to install the headers! Had to remove both motor mount brackets and lift the engine up quite a bit to sneak them in. Also the stock studs and nuts need to be removed before installing the headers and be sure to check the thread pitch of your bolts as the set comes with two different bolts. The gaskets leave a lot to be desired. I reused the stockers since I had 400 miles on them :D.


    Year: 2013 Submodel: Boss North Carolina

    Helpful (8)

  • 5/5

    Installation Time: Weekend

    March 23, 2013

    Sounds great, Serious gains, Tough Install

    After doing a ton of research I finally decided on the kooks 1-7/8 long tubes along with a O/R X pipe. Right out of the box headers looked incredible. Definitely made the right choice going with kooks. Like always American Muscle comes through with a speedy delivery. Started the install on a wednesday night, finished saturday afternoon. A rough total of 25 hours. Did it in my garage with a floor jack and jack stands. I would not recommend doing this with out a lift. All angles were next to impossible to get to even with all the right tools. Plus laying on your back for 3 days straight isn't the best feeling. All in all the headers fit pretty well. Had to wrestle the drivers side in a little bit but with some time got it into place. The car sounds incredible on the first start. It really changed the sound of just my Roush axel backs. I would absolutely recommend this to anyone looking to do long tubes. Have not gotten it on a dyno yet but expecting some pretty decent gains. Only other thing I want to mention is o2 sensor fitment. A lot of people were saying you need extension harnesses or longer sensors. Its not true. My stock sensors reached without a problem. Front and rear. It just took a little work. Great product. Overall a good fit and some serious performance gains. These headers will definitely turn some heads.


    Year: 2013 Submodel: GT New Jersey, USA

    Helpful (4)

  • 5/5

    Installation Time: Full Day

    March 24, 2016

    Kooks 1-7/8

    One of the best quality headers on the market! Install isn't for the faint of heart took about 4-5 hours for total install with access to a lift. Car sounds like a completely different animal now! Highly recommend these headers in 1-7/8 if you plan on going boosted in the future.


    Year: 2012 Submodel: Boss

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    December 17, 2015

    If you want high quality, these are the Headers you want.

    I got these for my 2011 Coyote because I had an end goal in mind, high horsepower boosted application. That being said I opted for the 1 7/8 headers because these cars flow so much more then previous years. Install on these is so straight forward and can be done with simple hand tools. Granted I had a lift to my disposal, I can't see why this would be any harder on jack stands in a garage. My car Dyno'd at 373hp/347tq in stock form. With just the Kooks 1 7/8, Catless mid pipe, and catbacks, the car has made an astounding 441hp/418tq. If you're looking for a quality set of headers, that will both look great, never tarnish, perform with high expectations, and just simply cause no head-ache install wise. These are the headers for you.


    Year: 2011 Submodel: GT Phoenixville, PA

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    March 22, 2013

    Incredible Product

    Kooks did a fantastic job with these products. Installed these headers on a lift help from an Infiniti enthusiast with a heavily modified G35 and he was blown away by the quality as was I. The sound with the high flow catted X pipe and my Magnaflow Competition catback will wake the dead. My setup sounds like a race car. You can really feel the power all the way through the ENTIRE power band, no drop off with a good tune anywhere (thank you Bama!). It is a rough install though. Took about 6 hours from start to finish. Read the instructions, too. You may think you know what you're doing but you'll thank yourself later. For those who want the best, I highly recommend them all the way.


    Year: 2011 Submodel: GT Milwaukee, WI

    Helpful (1)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    February 22, 2013

    HP Gain vs stock

    If you want to upgrade from stock, don't bother with anything else. You can feel the HP gain thru the RPM range. Can't be happier with the preformance. Had them shopped installed. They complained that it was a tuff job. The next guy will pay more to have them installed by my shop. So I'm happy I didn't try to install them myself. They are a very tight fit. Specially on the passenger side. Had to remove a bolt that fastens the air conditioning line cause it was hitting the passenger side headers and wire tied it to another line, It cost the same to shop install short headers or long headers. So don't bother with shorties. You'll be disappointed with the HP gain and you'll only save a few buck. Expensive upgrade, but with the X pipes and a tune, the car feels way more powerful. Finally, the exhaust growl puts a smile on my face.


    Year: 2013 Submodel: GT West Chester, PA, USA

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    October 22, 2015

    Great sound

    My mustang is 2014 istall the long tube headers ( kooks) w/xpipe off road and stype catback The sound is awosome but its a biit loud Overall headers is perfect fit with perfect sound Now waiting for the jlt intake w/bama x4


    Year: 2014 Submodel: GT Saudi Arabia

    Helpful (0)

  • 5/5

    Installation Time: Weekend

    April 13, 2014

    great product

    I got these as a gift for my 22nd birthday. Good quality and beautiful to look at. Installing them was a real pain. It took me about 3 days to do with hand tools and jack stands in my driveway. The clearance in the engine bay was next to non existent. i would recommend having a shop do this if you are impatient because you must take your time. Another thing, if you are lowered like i am (1.5inches all around) you will have literally no ground clearance at all under the car. I will have to raise the car up to stock ride height which is a bummer but the power gains are ridiculous. I have the Kooks shorty H-pipe with the Boss 302 side exits and boy does it rumble down the highway. Sounds almost like a corvette or a ford stock car.


    Year: 2013 Submodel: GT Pleasantville, NY, USA

    Helpful (0)

  • 4/5

    Installation Time: Weekend

    July 05, 2013

    Awesome headers!

    I got these headers with the Kooks Boss 302 H-pipe and Kooks sidepipes w/QTP electric cutouts. It is insanely loud with the sidepipes open, but it sounds INCREDIBLE! My only complaint about the headers is that once I finished installing them, the steering shaft was rubbing one of the header pipes. I had read this about other brands, but not kooks. Temporarily, I shifted the motor over a qtr inch on the motor mount, and that fixed the rubbing. I will be putting a 1/2 spacer on the motor mount once it arrives. I would highly recommend paying somebody to install these. It took me a couple days, as I work during the day. This is by far the longest and hardest upgrade I have done to this car. I would say if you could get them installed for $750 or less, go for it!


    Year: 2011 Submodel: GT Alpharetta, GA, USA

    Helpful (1)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    May 26, 2012

    Nice and crispy

    I can feel The power behind these headers, two thumbs up!


    Year: 2011 Submodel: GT San Antonio, TX, USA

    Helpful (3)

  • 5/5

    Installation Time: Afternoon

    February 15, 2013

    Great Looks and Fit

    Long tubes really change the sound and pick up real HP and Torque. They are going to be run on the track only so the 1 7/8" larger size is great for the hi RPM's the car is going to be living in.


    Year: 2013 Submodel: GT Malvern, PA

    Helpful (0)

  • 5/5

    Installation Time: Weekend

    February 07, 2017

    Excellent Headers

    There isn't much you can say bad about Kooks headers since they are near perfect. Fit and finish are excellent. Mating up to the heads is spot on. Fitment in the engine bay is spot-on with plenty of clearance to all components. The install is very time consuming. Support the engine from above and drop the K member to make the install easier.


    Year: 2014 Submodel: GT

    Helpful (0)

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