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Kooks Long Tube Headers 1-3/4 in. (11-14 GT)

Market Price $1,178.83 You Save 10% ($117.88)

$1,060.95

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  • Item 65503
  • MPN# 11412200

In Stock Ships same business day. Choose options to add to cart

Features & Details

  • Increases RWHP and Torque
  • Long Tube Header Design
  • Free Flowing 1-3/4" 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 manifolds, boosting your Pony's horsepower and torque numbers.

Quality Construction. Kooks Long Tube Exhaust headers are manufactured from 1-3/4" 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. Stainless steel hardware and gaskets are included.

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.

Fitment: 2011 2012 2013 2014 Details

What's in the Box
  • (1) Driver side header
  • (1) Passenger side header
  • (2) Gaskets
  • (16) Flange bolts
  • (4) Bolts
  • (4) Nuts
  • (8) Flat washers
Installation Info
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

5/5
Kooks long tube 1-3/4th

Purchased these and of course the shipping was fast. Only problem I had with the install was the hardware box that came with the headers was the gaskets for the new headers were bent and one was snapped ...

Read More
Helpful (1)

5/5
Amazing

These headers are truly amazing. Great finish and fitment. I had the roush axel back exhaust before and it sounded good but now the car has a completely different sounds. I've had so many compliments on ...

Read More
Helpful (1)

Overall Rating 4.9 out of 5 stars
Read All 16 Reviews

Customer Photos (3) Submit Your Photo

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5 Questions / 6 Answers

Ask a Question

Guys, I really need a help over here, How much Horse power and torque would this headers add to my 2013 mustang gt?30-40 maybe? approximately

Troy316

  • I picked up 25'ish RWHP with my Kooks 1 7/8" long tubes and high flow cats when paired with a tune. I would expect the same with 1 3/4" if you're still N/A. Oh and a TON of sound!

    nsastang87xx

    Good Answer (1) (0)

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Kooks Long Tube Headers 1-3/4in (11-13 GT) I was wondering if Kooks Long Tube Headers 1-3/4in (11-13 GT) will fit the automatic or just manual

tt4vn9yu

  • They fit automatics just as well as manuals. Have fun with your build!!

    seeul8tr

    Good Answer (0) (0)

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Loudness Which headers are louder the 1 7/8in. or the 1 3/4in. I would assume the 1 7/8 are louder but just curious.

JohnnyWalker

  • Headers don't increase the noise level. They can improve performance and change the sound pitch. If noise is what your after that would be in what muffles and diameter exhaust pipe you use. Try changing the cat. back system and maybe the intermediate pipe to an X pipe.

    Gunslinger

    Good Answer (0) (1)

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Kooks Long Tube Headers I already have the Boss 302 Quad Exhaust H-pipe and don't want to replace it. Are these headers a viable replacement for the stock manifold or should I look for something else?

Kaztass

  • The Kooks Long Tube Headers will require our Boss specific H-Pipe to retain the factory side pipes on this application. We do offer an Super Street Series Header that will bolt up to the factory boss h-pipe.

    Kooks Headers

    Good Answer (0) (0)

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purchased a 2011 GTCS with Kooks long tube and midpipe. Is the any way to trick the computer to get the check engine light to go off. It reads low efficient flow which I know it is the cats. Any suggestions would be very helpful. I bought this car out if state and my state requires it to pass

69mach

  • Absolutely. All you need is a tune. You may be able to ask a shop to do so as well, but they might only do what is necessary to switch off the light. It's best to run a proper tune so that you may maximize the efficiency that these headers have to offer. My suggestion, buy a tuner (available here on AM). Not only will it solve your problem, but you will have free tunes for life, which may be changed anytime that you do a mod that requires a tuning. You can also always turn off any "idiot" lights that may come on as well. The only issue, depending on which state you live in, is whether or not you have a midpipe with high-flow cats or not. If it's an off-road mid pipe, you may fail the visual inspection/sniffer test. Again, this all depends on which state you live in (for instance, you will fail a smog test in CA if you have an O/R pipe.)

    ShdwReaper

    Good Answer (0) (0)

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Customer Reviews (16) Write a Review

Overall Rating 4.9

out of 5 stars

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain 4.933333 4.9
  • Fit 4.8 4.8



  • 5/5

    October 13, 2016

    Kooks Long Tube Headers

    The craftsmanship that goes into these headers is top notch. The Kooks Long Tube Headers gave the mustang a deeper sounding rumble. Perfect !!!!

    jimaki141

    Year: 2013 Submodel: GT

    Helpful (1) (0)

  • 5/5

    Installation Time: Full Day

    June 08, 2016

    Kooks long tube 1-3/4th

    Purchased these and of course the shipping was fast. Only problem I had with the install was the hardware box that came with the headers was the gaskets for the new headers were bent and one was snapped in have. Had to overnight a gasket from Indianapolis. Install was fairly simple except getting the old hardware off the stock headers. Once everything was installed and custom h pipe set up with hi flows cats were mounted up it was time to take it for a test run. The sound and throttle response were amazing. No drone, no rough idle, and nothing but smiles from the roar above 2500 rpms. Would recommend. Kooks is the way to go. Plus I don't need to Uninstall a side to get to the tranny which is always a plus.

    Iamreallybatman

    Year: 2012 Submodel: GT

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    March 28, 2016

    Amazing

    These headers are truly amazing. Great finish and fitment. I had the roush axel back exhaust before and it sounded good but now the car has a completely different sounds. I've had so many compliments on the amazing roar of my gt. Now let's talk power, totally worth spending more money to get kooks, the power gains are unreal. You instantly feel the torque and hp difference. If you're thinking about going with kooks, stop thinking and buy them. Worth every cent.

    MADSTANG

    Year: 2013 Submodel: GT

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    January 20, 2016

    amazing

    The kooks headers are one sweet product, she doesn't want to stop, just wants to run lol

    blackbeauty

    CT

    Helpful (1) (0)

  • 5/5

    Installation Time: Weekend

    February 05, 2013

    Worth the squeeze!

    The performance gain and exhaust note on these headers is nothing short of outstanding. They took me and an ASE Certified tech 24 hours to install them on a lift. If you plan on installing them yourself, save tons of time and just drop the K-member instead of working around it, you will be glad you did. Kooks makes a great product, but they will not stand behind it if it breaks. Not my best experience with customer service.

    Banshie50

    Year: 2012 Submodel: GT Starkville, MS 39759, USA

    Helpful (3) (0)

  • 5/5

    Installation Time: Weekend

    March 26, 2014

    I love 'em.

    I did a lot of research before pulling the trigger on these. I bought the catted H-pipe to go along with it because I prefer the sound of an H to the X. The quality of these headers is top notch. The price is a bit steep, but I used some discounts on this and in the end, they weren't much more expensive than most of the others. As far as the installation went... it was fun. It tooke me 12 hours to do it and I was taking my time. I reccomend taking a break halfway thru and do the install over 2 days. You don't have to drop the K-member. I raised the engine about 1.5" with a floor jack and had no problem getting the headers in. Plenty of ground clearance. Fitment is great, the only thing that got in the way is the cap that goes over the the starter wire. Part of the cap touched the header so I had to cut some of it off. Other than that... awesome. I had mine ceramic coated titanium. *almost* matches the valve cover, but it's close enough to look good (what you can see...) These headers, Kooks catted h-pipe and GT500 axle backs makes a great sound. No drone on the highway, and a nice throaty sound that is not over the top. I would install these again, and wouldn't hesitate to reccomend them to a friend.

    HitmansGT

    Year: 2014 Submodel: GT Springfield, mo

    Helpful (2) (0)

  • 5/5

    Installation Time: Full Day

    November 22, 2013

    Kooks headers are awesome !!

    There awesome header and they make the car sound great it made mine so much louder the only thing that I would say was a pain was the install, the install took awhile and ran into a couple problems ( did it on the ground with a jack and stands ) but overall it turned out great I highly recommend this product

    Justinsenese

    Year: 2013 Submodel: GT New York, NY, USA

    Helpful (2) (0)

  • 5/5

    Installation Time: Weekend

    December 26, 2012

    Kooks LT

    Overall great product. Great quality. It's definitely a weekend job. But well worth it. I notice the power gains along with a tune. I don't have any complaints other then american muscle sent me the wrong threaded header bolts. No big deal I picked some up from a local shop.

    Matt485

    Year: 2012 Submodel: GT

    Helpful (2) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    May 14, 2015

    Great upgrade, excellent product

    I couldn't decide between shorties with catless pipes or regular long tubes; so these were that perfect middle ground since they are technically intermediate. Combined with the kooks catless 3" boss h pipe, kooks 3 in cat back and ford boss side pipes the sound is better than I could have ever dreamed possible with motors these days. I had gains through the rpms in all gears so I am very pleased with these and their performance. Very highly recommended.

    ColtonH

    Year: 2014 Submodel: GT Claremore, OK

    Helpful (1) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $250-$500

    September 09, 2014

    Boss 302 + Kooks LT + Kooks Catted H-Pipe = BEAST!!!

    Definitely a good investment and a great upgrade for your 2012-2013 Boss 302. I had the local dealership installed it and took them a while. Sound was amazing with the kooks catted H-Pipe so I was able to retain my side pipes. Sound was so amazing....did I say that already? WTH....I can say it over and over again. I still have my Track Key installed and the sound was indescribable with the lopey idle. Great power gains. Price is a bit steep but I guarantee you'll love it.

    Orangejazz

    Year: 2013 Submodel: Boss Guam

    Helpful (1) (0)

  • 4/5

    Installation Time: Afternoon

    January 24, 2013

    Great Product

    Kooks actually included the wrong bolts and wanted me to send pictures of their mistake. After doing so, they quickly mailed out the correct bolts. I have the high flow catted x-pipe also and I probably should have gone with the off road. (Engine light still appears regardless cant pass emissions) Very noticeable gains in torque and horse power.

    Black11Roush

    Year: 2011 Submodel: GT Houston, TX

    Helpful (2) (1)

  • 5/5

    Installation Time: Weekend

    May 22, 2012

    Amazing!!!!

    As the title says, these headers are AMAZING. I've gotten TONS of compliments and people asking what kind of exhaust I've got. They say it's the best they've heard racing down the track. With these headers and the Kooks off road x-pipe you can't go wrong. Installation was a task as I decided to install them in my garage on jack stands. The instructions are clear, however they say install them from the rear but we had to install the drivers side through the top and remove the altenator. Took roughly 38 hours to install, but I've never taken on a task this big. For someone that works on cars on a daily or weekly basis it probably won't take them near as long. If you're questioning yourself on whether to buy these or not... DO IT you won't be dissapointed!

    CrzyHrs

    Year: 2012 Submodel: GT Huntsville, AL

    Helpful (3) (2)

  • 5/5

    Installation Time: Full Day

    June 26, 2014

    gang941

    Headers+Kooks catted X-pipe, and Bama tune... Well worth the $$$$ spent...

    gang941

    Year: 2014 Submodel: GT Bradenton, FL, USA

    Helpful (0) (1)

  • 5/5

    Installation Time: Weekend

    May 28, 2014

    Great product. 100% Happy

    Took a little longer than I thought to install the headers but in the end it was all worth it. The performance gain and sound are just awesome! Couldn't be happier.

    2013KenneBell50

    Year: 2013 Submodel: GT Monterey, CA, USA

    Helpful (0) (1)

  • 5/5

    Installation Time: Full Day

    March 15, 2016

    kook,s long tube headers 1 3/4

    these are great sound wonderful on my mustang,a good purchase for making my 2013 mustang sound better and have more horsepower

    froggie64

    Year: 2013 Submodel: GT

    Helpful (0) (1)

  • 5/5

    Installation Time: Afternoon

    October 18, 2016

    Well worth the money

    I was a little skeptical at first with the price cost, but once I pulled the trigger, I'm glad I did. Coupled it with Kooks O/R H-pipe and a retune and got a 23rwhp/19rwtq boost. If you're in the market for headers and wondering between Kooks and another brand, I'd suggest biting your tongue and saving till you can get these. They have definitely made the car sound meaner!

    Harambe

    Year: 2014 Submodel: GT

    Helpful (0) (0)

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