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

Market Price $1,250.99 You Save 12% ($144.42)
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$1,106.57

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  • Item 65503
  • MPN# 11412200

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    Features, Video & 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

    Review & Installation Video

    Review & Install 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 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 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

    CA Residents: Warning: California's Proposition 65

    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?

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    Questions & Answers (20)

    5 Top Rated Questions

    Doesn't list that O2 extensions are included in the box. Will I need front, rear, or both O2 extensions with these headers?

    • O2 extensions will not be needed with this kit as these headers have the O2 bungs in the factory location.

    Helpful (1)

    Got a 2014 mustang gt have the roush axle backs installed and would like the car to be louder haha my question is should I go with the 1 3/4 inch kooks long tube headers the car is N/A also what kind of mid pipe would go well for the headers catted off road x pipes or h pipes

    • For lightly modified Mustangs, we recommend the Kooks Long Tube Headers in 1 3/4" primary tubes. We only offers X pipes that will match up to these headers at this time.

    Helpful (1)

    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

    • 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!

    Helpful (1)

    Is the primary tubes inside diameter or outside diameter?

    • The primaries on these headers would be 1 3/4" ID.

    Helpful (0)

    Can they be delivered to California for “off road” use only?

    • The Kooks 1-3/4 in. Long Tube Headers (11-14 GT) is available to be shipped to California but does not meet CARB requirements. As such it is only legal for use on off road, non-pollution controlled vehicles.

    Helpful (0)
    Post Your Question
    10 More Questions
    It may be my eyes fooling me, but do these headers have less ground clearance than the factory ones? Will I be safe installing these on a lowered mustang? 1 answer
    so im confused about my previous question with the kooks x pipe lining up with the flowmaster outlaw catback. one answer said it would work and the other said it would require modification? 1 answer
    i have a 2014 gt and i installed the flowmaster outlaw catback exhaust. i want to get these long tube headers along with the kooks off road X pipe. will the kooks off road X pipe fit onto the outlaw pipes if i remove the outlaw X pipe provided? 2 answers
    Can I use the GREEN catted H pipe with this or just the x pipes? 1 answer
    With the boss 302 intake manifold and jlt cold air intake, which header would be better 1/3/4 or 1/7/8? 1 answer
    do these headers require o2 sensor extensions? 1 answer
    Does this headers fits on corsa x pipe or not? 1 answer
    with the cobra jet intake which header would be better 13/4 OR 17/8. and can I still use my stock h pipe 1 answer
    Are there any long tube headers that are emission legal for a 2013 gt. And would i see any real hp if I to kept my stock mufflers etc. I don't want the loud cabin hummming noise on the highway. 1 answer
    after seeing a video of these with magnaflow catbacks thinking about long tubes for my stock 2014 gt .which size would be better,1-3/4 or 1-7/8. 1 answer

    People Who Bought This Item Also Bought

    Customer Reviews (22) Write a Review

    Overall Rating 5

    out of 5 stars

    Installation Time:Weekend

    Installation Cost:$250-$500

    • Performance Gain 4.857143 4.9
    • Fit 4.857143 4.9



    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      September 19, 2018

      The best!

      High end product! The well packaged headers arrived fast from AM. Once installed the sound is sick! It totally tranformes the car into a sports car! FYI these headers do NOT require O2 sensor extensions.

      SeanH

      Year: 2013 Submodel: GT

      Helpful (1)

    • 5/5

      Installation Time: Weekend

      November 11, 2017

      Kooks for the win!

      I installed these headers on my back without dropping the k-member and I can confirm these are a super PITA to install. Having the right tools and patiences goes a long ways. But it was totally worth it in the end. My car's exhaust note sounds prefect to me now. The headers are paired up with the Kooks catted h-pipe with side exhaust and QTP electronic cutouts, factory OTA, and Borla S-Types. I haven't dynoed the car but it does feel like it gain some power throughout the power curve. CONS: The Stage-8 fastener locking clips rattle around a whole lot especially at the header collector and h-pipe joint. This caused a bunch of false knock activity for me. Removing the locking clips fixed this issue. I had fitment issues with the factory Boss 302 side pipes. The side pipe mounting hole did not line up with the chassis's mounting point on the passenger side. Driver side fit perfectly. Not sure if this is an issue with the Kooks h-pipe or just the product of tolerance stack-ups of my particular setup. So for now I'm running without the side pipes, the car sounds good with the cutouts fully open and I no longer get that annoying jake-brake sound on decel, but it does drone pretty bad around 2k. Good thing a simple flip of a switch fixes that.

      Jeremy

      Year: 2014 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      August 12, 2017

      quality

      set up with o/r x pipe and borla atak axel backs sounds perfect

      Sosa

      Year: 2012 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Weekend

      June 18, 2017

      Header upgrade

      These fit up great! Nice look, sound and power add!

      Michael

      Year: 2012 Submodel: GT

      Helpful (3)

    • 5/5

      February 20, 2017

      Long tube headers

      Fit great look good on car and the sound is just down right mean first time using long tube headers and you can relly tell the diffrence over stock exhaust

      RickyS

      Year: 2014 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      December 10, 2016

      GREAT QUALITY!!

      All I can say is wow kooks is top notch quality a little pricey but worth every cent and when paired with a bama tune I can feel a difference in power. Overall a great product would definitely buy these again!!

      Whitestang23

      Year: 2014 Submodel: GT

      Helpful (4)

    • 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 (4)

    • 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 (4)

    • 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 (4)

    • 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 (5)

    • 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 (4)

    • 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 (4)

    • 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 (4)

    • 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 (4)

    • 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 (4)

    • 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 (3)

    • 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 (5)

    • 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 (6)

    • 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 (6)

    • 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 (6)

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