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

9 Reviews
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  • Item #65511
  • MPN #60-41-188
  • Market Price $1,122.21
  • You Save 10% ($112.22)
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Product Videos Customer Photos
  • 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
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 stock 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 Bama 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.

Mustang 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

Installation Time: (approx) a Day

Difficulty Level:Mechanical expertise or professional installation required.

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

Most Helpful Reviews View All

Overall Rating 4.6/5 Write a Review
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

Helpful (19) (7)

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

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Helpful (8) (2)


Hey, I'm Justin with, and I'm going to be taking a closer look at the Kooks long tube headers fitting all 2011 and newer Mustang GTs. Alright, first things first, these long tubes from View Full Transcript

Customer Photos (3) View All

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Q & A (4 Questions, 8 Answers) Ask a Question

Fitment Are these the ones to use with the Kooks Catted Shorty H-Pipe (12-13 Boss)

DougE Year: 2013 Model: Boss

Question Resolved
Good Question (0) (0)
  • That is the way to roll, keep it all the same you will get the best out of the overall sound and performance

    Helpful (0) (0)

    Miltons Year: 2010 Model: GT

    Top 1000 Contributor

Show 2 more answers

catted or off road i have been asking my self for a long time now if i should go catted or offroad x-pipe. what would you guys recommend and why. i really want my car to be as loud as possible but i dont want any trouble with my car because im not running cats.

Pepe27 Year: 2013 Model: GT

Question Resolved
Good Question (0) (0)
  • If you want it to be as loud as possible then go with the off road x pipe... The cats tame it down a little bit so not having them will make it louder, also if you have a custom tune you will not have any problems with out the cats you will actually pick up even more power not having them, the only down fall is if you have a state inspection you most likely will fail due to not having the cats otherwise no problem, it will simply be loud and powerful.

    Helpful (1) (1)

    Kyle2013 Year: 2013 Model: GT

Show 2 more answers

How does the weight compare to stock? I have seen several other headers that weight their setup vs stock. So I guess the question is, How much does the header/mid pipe combo weight? And how much does the stock combo weight?

drewk85 Year: 2012 Model: GT

Good Question (0) (0)
  • Long tube headers and mid pipe i would says at lease 40lbs difference

    Helpful (0) (0)

    Leblanc Year: 2011 Model: GT

Show 1 more answer Answer This Question

Reviews (9) Write a Review

  • 5 Stars .56 56%
  • 4 Stars .44 44%
  • 3 Stars 0 0%
  • 2 Stars 0 0%
  • 1 Stars 0 0%

out of 5 stars

9 Customers Recommend this Product

Installation Time:Weekend

Installation Cost:$500-$1000

  • Performance Gain: 4.875 4.9/5
  • Fit: 3.875 3.9/5
  • Bang For Your Buck: 4.25 4.3/5
Filter By Sort By
  • 5/5

    Long Tube Headers

    April 23, 2011

    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 Model: GT Driving Style: Street / Strip

    Helpful (19) (7)

  • 4/5

    Awesome sound

    August 17, 2012

    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 Model: Boss Driving Style: Street / Strip 'Stangs I have owned: 2 North Carolina

    Helpful (8) (2)

  • 5/5

    Sounds great, Serious gains, Tough Install

    March 23, 2013

    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 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 New Jersey, USA

    Helpful (4) (0)

  • 5/5

    Incredible Product

    March 22, 2013

    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.

    Top 250 Contributor


    Year: 2011 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 1 Milwaukee, WI

    Helpful (1) (1)

  • 4/5

    HP Gain vs stock

    February 22, 2013

    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 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 West Chester, PA, USA

    Helpful (1) (1)

  • 5/5

    great product

    April 13, 2014

    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.

    Top 500 Contributor


    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Pleasantville, NY, USA

    Helpful (0) (1)

  • 4/5

    Awesome headers!

    July 05, 2013

    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!

    Top 100 Contributor


    Year: 2011 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Alpharetta, GA, USA

    Helpful (1) (2)

  • 4/5

    Nice and crispy

    May 26, 2012

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


    Year: 2011 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 5 San Antonio, TX, USA

    Helpful (3) (6)

  • 5/5

    Great Looks and Fit

    February 15, 2013

    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 Model: GT Driving Style: Race 'Stangs I have owned: 10+ Malvern, PA

    Helpful (0) (4)

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