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Kooks 1-7/8 in. Long Tube Catted Headers (15-17 GT)

Market Price $1,903.41 You Save 10% ($190.34)
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  • Item 386636
  • MPN# 1151H420

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Features, Video & Details

  • Increases RWHP and Torque
  • Long Tube Header Design
  • Catted Connection Pipe
  • High Flow Catalytic Converters
  • Free Flowing 1-7/8" Mandrel-Bent Tubing
  • 304 Stainless Steel Construction
  • 3" Collectors w/ Scavenging Spikes
  • Fits Left Hand Drive Models Only
  • Fits 2015-2017 GT Mustangs

Review & Installation Video

Review & Install Video

Hey everybody, I'm Justin with and this is my detailed review of the Kooks Catted Long Tube Headers available for your 2015 and up Mustang GT. Now when checking out long tube headers for your S550 GT, you're going to find a few different options here at AM. All of them quality and all of them landing somewhere between the one to $2,000 mark with the Kooks Catted options coming in right in the middle of that. Now let's face it guys, long tube headers aren't exactly cheap. They're a solid investment, they're difficult to install, but they are going to be worth it. In fact, with the Kooks headers, expect gains of 20 to 25 wheel horsepower depending on your setup and depending on your tune in addition to the awesome change to your exhaust tone. So with all that said guys, let's talk about why you might want to consider a set of long tubes from Kooks for your new GT. Well, honestly, it's simple. This is what Kooks is known for. This is their bread and butter, top quality materials here guys, 304 grade stainless steel throughout, perfect welds all made in the U.S.A. This is what you are looking for when making a big investment in a set of long tube headers. These are a catted version, so again, you are going to get the high flow cats here. It is going to add a little bit more to the final cost. Kooks does of course offer an off-road version of the same headers. It's going to help keep the cost down a little bit more and you are going to be seeing some slightly bigger gains with that option. Now, this is the one and seven eighths inch version here from Kooks and I think you guys will find this is going to be the most commonly offered size for your Coyote-powered S550 GT. I should point out though that Kooks does offer a slightly smaller runner and a one and three quarter inch version, and you can debate the difference in sizes until you're blue in the face, but here's the deal in the nutshell, guys. That smaller runner is going to be better and more traditionally suited for a naturally aspirated application bolt-on car, things like that, whereas the one and seven eighths inch version I have here will be just fine for NA stuff, but will really shine once you go boosted or once you go for big power. So, basically if you want a header you can grow into, the one and seven eighths is generally the recommended choice. But again guys, don't take my word for it. Feel free to do some research on your own or always reach out to a Mustang expert if you should need a little bit more help. The Kooks headers do feature a rather large three inch merge style collector, as you can see here, and this is equipped with Kooks patented scavenger spike system. So I know you can't see it now, but basically, if I were to cut right here, lop off this merge style collector, you're going to find a long spike protruding separating all the primaries. And what Kooks claims is that's going to actually improve exhaust scavenging and increase the exhaust flow in the process. Now one thing that I do really enjoy about the Kooks long tubes, guys, is that all the primaries or all the tubing are essentially one piece, from the flange all the way down to the collector. And what that's going to do is eliminate extra welds, which can sometimes be a target area for cracks or weak spots. So what you'll find with some lesser quality headers, basically they'll use a number of smaller pieces welded together to make these bends. And again, they can lead to cracking if the welds are done poorly. But again, Kooks keeping them one piece here. It's going to make for a much cleaner product overall, and it's going to eliminate any of those weak spots that might crack down the road. The Kooks long tube system is a factory linked system. And what I mean by that is, with everything in place here, it will bolt up to your factory cat-back or even your aftermarket catback without issue. As for the install, well, I'm not going to sugarcoat this one guys, it's not exactly fun. In fact, I don't hand out many three out of three wrench installs here at AmericanMuscle, but believe me when I tell you, long tubes for your Coyote will get a three out of three wrench install job from me 100% of the time. Now, we call it a full day here on the site guys, and I believe that to be accurate. You can do this one on jack stands, but I highly recommend you don't. Obviously, a lift will be your best friend here. If this all sounds a little too intimidating, of course don't be afraid to leave this one in the hands of your local shop. You can thank me later. All right guys, to wrap things up here with the Kooks long tubes, well what can I say? These are definitely a premium option when you're shopping for long tubes for your Coyote-powered GT. The quality is great, the craftsmanship is unmatched and they're going to fit like a glove. And again, I would go with the one and seven eighths over the one and three quarters. I know we talked about it a little earlier, but this is going to be the header you can grow into. It's going to work just fine if you're NA, but then if and when you go boosted, this is going to be the ticket for you as well. So be sure to check out a set of Kooks long tubes for your Coyote-powered GT right here at

More Horsepower and Torque. A set of Kooks Long Tube Catted Headers will greatly improve the performance of your 2015-2017 GT Mustang. Kooks Headers feature high flow catalytic converters and an integrated venturi style collector that increases exhaust scavenging and reduces turbulence. As a result, it will improve your S550'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 1-7/8" mandrel bent 304 stainless steel tubing that merges into 3" collectors with scavenger spikes for superior airflow. These headers feature a leak-free ball and socket design for optimal performance and a better than OEM fit.

Recommended Upgrade. To realize the full power potential that these Long Tube Catted 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 1-7/8 in Long Tube Catted Headers are specifically designed to fit the 2015-2017 5.0L GT Mustangs and is a direct bolt on to the stock exhaust system.

Technical Note. Not legal for use on pollution controlled motor vehicles; intended for off road use only.These Headers are intended for left hand drive applications only.

Fitment: 2015 2016 2017 Details

What's in the Box
  • (2) Long Tube Headers
  • (1) Catted Connection Pipe Assembly
  • (2) Gaskets
  • (2) Clamps
  • (16) Small Bolts
  • (8) Flat Washers
  • (4) Long Bolts
  • (4) Nuts
  • (1) O2 Connector
Installation Info
Tech Specs
Header Specifications
Header Type: Long Tube Type Mid Pipe Required: Stock Factory
Material: 304 Stainless Steel Finish: Natural
Catalytic Converter: "Yes" - For off-road use only Fitment: 2015-2017 GT Mustangs
Will it fit my Mustang?
  • GT - 15, 16, 17

These Headers are intended for left hand drive applications only.

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Most Helpful Reviews

Worth it!!!

I saved up for theses baby's and it was worth it. Acceleration has increased big time. It took me 13 hours for the install and I used a lift. I do not recommend doing it on jack stands. When installing ...

Read More
Helpful (3)

Kooks headers.

With 0 knowledge on how to do this install I tackled it anyway. If you do not mind a bit of frustration that goes with this install then this is the mod for you. Not that difficult but space if very limited. ...

Read More
Helpful (2)

Overall Rating 5 out of 5 stars
Read All 7 Reviews

Customer Photos (5) Submit Your Photo

View All 5 Photos

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15 Questions / 6 Answers

Ask a Question

Could you run a ghost cam tune with these highflow cats?


  • BAMA can write ghost cam tunes for off road or catted applications, so the Kooks 1-7/8 in. Long Tube Catted Headers can be used with a ghost cam tune.

    Rob D

Helpful (0)

Will theses work work with the 2.5" cat back Borla atak exhaust??


  • The Kooks 1-7/8 in. Long Tube Catted Headers will fit with 2.5" cat back Borla atak exhaust.

    Pat K

Helpful (0)

I have the Corsa Extreme 3 in. exhaust system. What will I need to make these work with that system?


  • The Kooks 1-7/8 in. Long Tube Catted Headers will work with your Corsa Extreme.

    Pat K

Helpful (0)

Will I have to to replace my Borla ATAK axle back exhaust?


  • Installation of the Kooks 1-7/8ths long tube catted headers will not require you to replace your Borla ATAK axle back exhaust system.


Helpful (0)

Will these headers reduce ground clearance at all?


  • Doing long tube headers will reduce ground clearance by a little yes.


Helpful (0)

Does this or the non catted version throw check engine codes?


  • These come with high flow Catalytic converters. There is a very low chance that these will turn on your check engine light. If you get the none catted version a check engine light will be thrown. The only way you can get that turned off would be to get a custom tune for this application.


Helpful (0)

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Customer Reviews (7) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Weekend

Installation Cost:$500-$1000

  • Performance Gain 5 5
  • Fit 4.666667 4.7

  • 5/5

    Installation Time: Full Day

    December 09, 2016

    Worth it!!!

    I saved up for theses baby's and it was worth it. Acceleration has increased big time. It took me 13 hours for the install and I used a lift. I do not recommend doing it on jack stands. When installing the upper header nuts passenger side. I used a 15 mm stubby open end. I did not use the stage 8 bolts because I did not want to potentially damage my heads when removing the stock bolts. When installing passenger side long tube you will have to remove the bottom three bolts to allow you to slide the header in. I also had to remove my Steeda g track brace when installing, but was able to reinstall after header was on heads.


    Year: 2015 Submodel: GT

    Helpful (3)

  • 5/5

    Installation Time: Weekend

    April 25, 2017

    Kooks headers.

    With 0 knowledge on how to do this install I tackled it anyway. If you do not mind a bit of frustration that goes with this install then this is the mod for you. Not that difficult but space if very limited. The sound they make after you pair kooks headers with a nice catback makes it all worth it in the end.


    Year: 2017 Submodel: GT

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $500-$1000

    April 12, 2017

    Great add on for immediate satisfaction!

    I took quite a while deciding on the right set of long tubes for my 17 CS, but in the end went with the Kooks long tubes and have not been disappointed. You will feel the power and more aggressive exhaust tone immediately. I would not hesitate to buy Kooks headers again.


    Year: 2017 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    November 25, 2016

    Top notch

    Best headers that you can buy. I bought the catted versions and so far, no check engine light. Amazing sound. As for the install, I thought they were crazy saying a day to install. Well, they weren't. Very time consuming turning the nuts and installing the new bolts. Some are easy, some are a pain. Make sure that you have a set of ratcheting wrenches that pivot at the head. As for removing the studs, reverse torx sockets. One I didn't have enough clearance so a 12 point 1/4 inch wrench worked. I supported the engine from the top and raised it from there. This also allowed me to lower one side and raise the other to get a little more clearance. I have a lift. I raised the car just enough to use a roll around seat to work. Saves the back.


    Year: 2016 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    November 22, 2016

    Best headers in the market

    I just got to say that this is the best thing you can do to your car, i paired this whit the borla atak catback and let me tell you, It's loud so if you want yoir neighbors to hate your guts go for and the also arre going to envy you jajajajja but for real its loud and tje power difference its real nice and crispier acceleration took my mechanic 8 hours and 1000 dollars later they were installed i will definitely recomend this to any one next sstep is to take it to the dyno


    Year: 2016 Submodel: GT

    Helpful (1)

  • 5/5

    July 19, 2016

    Best Quality On the Market

    Kooks is my go to company when looking for headers. Its Quality is unmatched by any other company.The install took my buddies and me a couple of hours. Once finished the car changes completely. I would advise someone who might think of doing this job alone to go to your preferred mechanic to help you. Overall a great header for the money.


    Year: 2016 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    May 25, 2016

    Simply the Best

    Quality of materials, cuts, And welds are amazing. Fitment is amazing, they bring everything you need to install them. Installation took me a day I had a friend do What he could from the top of the engine while I did everything from underneath. I recommend buying antiseize for the 02 sensors And some high temp locktite for the header bolts. Also have a 15mm ratcheting wrench And an 11mm ratcheting wrench otherwise RIP to your shoulders And forearms. Other than that the installation went smooth as silk I have an mbrp catback And unfortunately they did not really mate Up to each other. I had to cut And weld two pieces of stainless steel piping in place of the factory sleeve clamp to ensure no exhaust leaks.


    Year: 2016 Submodel: GT

    Helpful (1)

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