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

Item 65503
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      Review & Installation Video

      Justin: So the Kooks one and three-quarter inch long tube headers here should appeal to the 2011 through '14 GT owners out there who are looking to grab one of the nicest long tubes in the category from a construction and build standpoint, and would prefer that slightly smaller one and three-quarter inch primary to the larger one and seven-eights inch header. Now, the Kooks headers here will not include a shorty mid-pipe right out of the box, so interested buyers will need to also pick up a corresponding Kooks X or H-pipe on the site to complete the overall package. Now, by themselves, the headers will run you right around 1,000 bucks and the install will get a knuckle-busting three out of three wrenches on the difficulty meter, and we will have a detailed walk-through to come later in the video. Now, for the guys out there who might not be aware, Kooks makes an absolutely killer header, and a killer product overall. In fact, I've had the pleasure of touring the Kooks facilities, and I can say the gang down there in North Carolina take a lot of pride in their work because it really does show in the final product as is the case here with this Coyote header. But why go with an aftermarket long tube header in the first place? Well, simple, right? To get more power and more sound out of your naturally aspirated or blown Coyote engine. Now, we are gonna show you guys some dyno numbers here. The car we're using does have some existing modifications like a Boss manifold and a custom tune, so we established a baseline run first, then got to work installing the Kooks long tube headers in addition to a catted X-pipe, re-ran the car and here are those results. Baseline run using our manual S197 GT gave us 398 horse power and 347 pound feet of torque at the rear wheels. With the Kooks long tubes in place, the car is now making 406 horse power and 349 pound feet of torque to the rear wheels. That's good for a peak gain of 8 horse power over those baseline numbers, and gains of as much as 18 horse power and 16 pound feet of torque under the curve. But power aside, another big draw with adding a long tube like this is just the total transformation of your exhaust tone and also your volume. Just a downright angry tone with a lot more bark is the best way I can sum it up. Now, ultimately, again, you're gonna have a few different things to help shape your sound, whether it be your mid-pipe, X or H, catless versus catted, in addition to the exhaust itself. But either way, just know that things are gonna be noticeably louder with a long tube in place. But let's get back to the Kooks headers we're talking about here in this video, and again, guys, just superb quality from the gang over at Kooks. This does include the premium 304-grade stainless steel throughout your mandrel bent one and three-quarter inch primaries, three-eights inch laser-cut flange at the head, all ending in your 3 inch collectors down here, of course loaded with Kooks' merge spike technology. And that's just basically designed to help increase exhaust velocity, scavenging, things like that, making for better flow overall. And on top of that, guys, just beautiful construction, quality welds, all the welds at the head have been smoothed out to help reduce that turbulence and just make for a better product overall. Let's touch on that one and three-quarter inch primary size a little bit more. Again, one of your most common diameters here in the Coyote aftermarket, along with that slightly larger one and seven-eights inch offering. And look, guys, they're both gonna make power over the factory manifolds you are replacing, but conventional wisdom might tell you, a smaller diameter primary will make slightly better torque at lower rpm levels but be more of a restriction at the upper rpm level when you're making bigger power and vice versa. So, what I will say the difference is going to be extremely minimal on most setups here, however, if you guys are leaning towards forced induction in the long road, I might steer you more towards that slightly larger primary like the one and seven-eights inch option for instance, but again, both will certainly make more power over those factory manifolds. Now, speaking of making more power, ideally I'd recommend pairing a long tube with a custom tune, not only to maximize your gains, but, if you do decide to go with an off-road or catless mid-pipe, it will address the secondary O2s on your ride. I do wanna remind you guys that the Kooks long tube headers, again, do not include a mid-pipe, meaning you're gonna need to purchase one separately in order to connect the long tubes to either your stock or aftermarket exhaust system. And I do wanna point out that Kooks offers a number of different mid-pipe solutions here on the site, it's one of the things I really dig about the company, including X and H-pipe variations, catless or off-road versions, obviously catted stuff as well, and even their green cat option, which is an EPA certified high flow cat. And those guys will often times owing the EPA emissions issues, and also some inefficiency codes as well that can sometimes come along with other high flow cat options. So, either way, guys, feel free to check out the many different mid-pipe solutions from Kooks, again, about six altogether, here at AM if you haven't already done so. Let's shift gears and talk about the installation, and honestly, guys, there's no sugarcoating this one, long tube headers on an S197 are not fun, so expect a full three out of three wrenches on the difficulty meter, and at least a day or two in the shop or garage to get this one knocked out. And to give you a better idea of what you're in for with this job, here's a detailed walk-through and a tool breakdown. Man: The first thing we're gonna do is remove the engine service cover, we got three 8 millimeter bolts. And after that we're gonna remove the K-member brace, that's gonna open up some room for us. All right. Next, with a 15 millimeter ratchet wrench we're gonna remove the chassis support brace here, there's four nuts. Next thing we're gonna do is remove the upper motor mount nuts, I got a 15 millimeter socket here and a long extension. I'm using a magnet to retrieve the fallen nut. We're now ready to remove our motor mounts. I have a 13 millimeter socket, I also am using a pole jack right here. Once we get our motor mounts loose, we're gonna lift the engine up three to four inches, and that's gonna give us some more room to remove our stock manifolds. You can now pull the right side motor mount out of the car. Lift the engine up slightly to get this guy out. Okay, we're gonna do the same thing on the left side now. Now we're ready to remove the stock manifolds. I have a 15 millimeter on a small extension, I'm gonna be switching up tools here, some of them are easier to get to, some of them are harder to get to. I went through and broke a couple loose, I'm gonna use a power ratchet to speed things up a little bit. Before we remove our manifold, we need to unclip the O2 sensor. Now we're ready to pull the stock header out of the car. We're gonna move on to the left side of the car now. First thing we're gonna do is disconnect our steering shaft and move that out of the way. From there we can start loosening up the manifold nuts. We're gonna take a Sharpie and put a straight line down the center of steering shaft so when we go to put it back together we can have it in the right orientation. All right, we've got all our nuts off of the stock manifold. I unclipped our O2 sensor, and now we can pull the stock manifold out. After that, we can begin to install our new Kooks headers. We are now ready to install our new long tube headers. We're gonna slide the long tubes up in place and get some nuts started on them. All right, we're now gonna install the right side long tube. Once all your bolts are tightened on your new long tubes, you can then reinstall your motor mounts. Okay, next, we can reconnect our steering shaft. Next thing we can do is put the right side motor mount back in place. I'm gonna lower the engine back down now. Once we get it all the way down we can get the nut started on the top of the motor mount, but we won't be able to tighten them up until the car is on the ground and we can get through it from the engine bay. We're gonna put our starter back in place now. All right. One of the last things we're gonna do under here is put our O2 sensors back in. I chose to do it somewhat last, you guys can put these in before you install your X-pipe or your headers, it's all up to you. All right. And now we're gonna plug it in. All right. We got a few things to wrap up here. This is the K-member support bar that can go back on. After this, we can put our K-member support brace back up, and that's gonna wrap things up. Yep. And we're using a 15 millimeter socket here to tighten these down. All right, guys, that's gonna wrap up our review and install. Be sure to check out more at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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 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 -


      Customer Reviews (23)

      Write a Review

      Ratings Summary

      5.0 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 (4)
      • 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


        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)

      Questions & Answers (23 answers)

      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

      Installation & What's in the Box

      Installation Info

      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

      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