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

Item 65503
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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

    MPN# 11412200

    CA Residents: WARNING: Cancer and Reproductive Harm -

    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?

      Customer Photos (9) Submit Your Photo

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        Questions & Answers (23)

        5 Top Rated Questions

        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 (4)

        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 (2)

        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 (2)

        Without cutting, Can these particular long tube headers be paired with a Stock Mid Pipe for a 2014 Mustang GT ?

        • No, these cannot be used with the stock midpipe.

        Helpful (0)

        If I'm wanting to eventually go with a blower should I just go ahead and buy the 1 7/8 pipe instead of the 3/4? I guess what I'm trying to figure out is going with the 7/8 going to hurt me in any way while I am not using a supercharger of any kind.

        • 1-7/8 headers are recommended for FI applications. They can also be used on NA applications with the correct tune but you will benefit from them more in FI applications.

        Helpful (0)
        10 More Questions
        Currently have 1 3/4in kooks headers on my car, if i was to go boost are 1 7/8in headers really necessary? 1 answer
        Is the primary tubes inside diameter or outside diameter? 1 answer
        Can they be delivered to California for “off road” use only? 1 answer
        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

          Customer Reviews (23) Write a Review

          Ratings Summary

          5 out of 5 overall rating from 23 customers

          Installation Time: Weekend

          Installation Cost: $250-$500

          • December 04, 2018

            5 2014 GT - TripleJ124 Installation Time: Shop Install Installation Cost: $250-$500

            Kooks Headers

            I bought this product along with the Kooks Catted H Pipe on Cyber Monday, and I must say, it was a fantastic decision. I took it to my local shop and they were able to take care of it in a day, fitment is perfect. Sound is amazing. Idle and cruising RPMs are a little louder than stock from the inside, but not obnoxious. Then when you step on the gas it roars alive. I’ll rate this at 11/10

            Helpful (3)
          • September 19, 2018

            5 2013 GT - SeanH Installation Time: Shop Install Installation Cost: $500-$1000

            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.

            Helpful (3)
          • November 11, 2017

            5 2014 GT - Jeremy Installation Time: Weekend

            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.

            Helpful (7)
          • August 12, 2017

            5 2012 GT - Sosa Installation Time: Shop Install Installation Cost: $250-$500


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

            Helpful (6)
          • June 18, 2017

            5 2012 GT - Michael Installation Time: Weekend

            Header upgrade

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

            Helpful (5)
          • February 20, 2017

            5 2014 GT - RickyS

            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

            Helpful (6)
          • December 10, 2016

            5 2014 GT - Whitestang23 Installation Time: Shop Install Installation Cost: $250-$500

            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!!

            Helpful (6)
          • October 18, 2016

            5 2014 GT - Harambe Installation Time: Afternoon

            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!

            Helpful (7)
          • October 13, 2016

            5 2013 GT - jimaki141

            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 !!!!

            Helpful (7)
          • June 08, 2016

            5 2012 GT - Iamreallybatman Installation Time: Full Day

            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.

            Helpful (6)
          • March 28, 2016

            5 2013 GT - MADSTANG Installation Time: Shop Install Installation Cost: $500-$1000


            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.

            Helpful (7)
          • March 15, 2016

            5 2013 GT - froggie64 Installation Time: Full Day

            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

            Helpful (6)
          • January 20, 2016

            5 - blackbeauty Installation Time: Afternoon


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

            Helpful (6)
          • May 14, 2015

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

            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.

            Helpful (6)
          • September 09, 2014

            5 2013 Boss - Orangejazz Installation Time: Shop Install Installation Cost: $250-$500

            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.

            Helpful (6)
          • June 26, 2014

            5 2014 GT - gang941 Installation Time: Full Day


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

            Helpful (7)
          • May 28, 2014

            5 2013 GT - 2013KenneBell50 Installation Time: Weekend

            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.

            Helpful (5)
          • March 26, 2014

            5 2014 GT - HitmansGT Installation Time: Weekend

            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.

            Helpful (8)
          • November 22, 2013

            5 2013 GT - Justinsenese Installation Time: Full Day

            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

            Helpful (8)
          • February 05, 2013

            5 2012 GT - Banshie50 Installation Time: Weekend

            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.

            Helpful (8)