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Kooks 1-3/4 in. Long Tube Catted Headers (15-17 GT)

AmericanMuscle no longer carries the Kooks 1-3/4 in. Long Tube Catted Headers (15-17 GT). Please check out 2015-2019 Mustang Long Tube Headers for an updated selection.
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Features & Details

  • Increases RWHP and Torque
  • Long Tube Header Design
  • Catted Connection Pipe
  • High Flow Catalytic Converters
  • Free Flowing 1-3/4" Mandrel-Bent Tubing
  • 304 Stainless Steel Construction
  • 3" Collectors w/ Scavenging Spikes
  • Fits Left Hand Drive Models Only
  • Fits 2015-2017 GT Mustangs
More Horsepower and Torque. A set of Kooks Long Tube Headers with high flow Catted Connection Pipe will greatly improve the performance of your 2015-2017 GT S550. Kooks Headers feature an integrated venturi style collector that increases exhaust scavenging and reduces turbulence. As a result, it will improve your Mustang's exhaust flow over the restrictive stock manifolds, boosting your horsepower and torque numbers.

Quality Construction. These Kooks Long Tube Exhaust Headers are manufactured from 1-3/4" 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 1-3/4" 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

CA Residents: Warning: California's Proposition 65

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?

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Questions & Answers (8)

5 Top Rated Questions

Will I have to add anything or buy anything to go with the corsa extream exhaust?

  • This will be able to directly bolt up to the mid-pipe that comes with the Corsa Xtreme catback exhaust system.

Helpful (1)

will these bolt up directly to the borla s-type 3in cat back? or will it need custom fabrication?

  • The Kooks 1-3/4 in. Long Tube Catted Headers will bolt directly up to your borla s-type 3 inch cat-back with no modifications.

Helpful (0)

If i don’t have an aftermarket exhaust will this fit? And any extensions for sensors needed?

  • These Kooks 1-3/4" 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.

Helpful (0)

Will this fit on the AWE switchpath catback exhaust without issue? Or will I need an adapter of some kind

  • The Kooks 1-3/4 in. Long Tube Catted Headers are indeed compatible with the AWE SwitchPath Cat-Back Exhaust systems as they are both compatible with their stock counterparts. I will post both catbacks below:

Helpful (0)

Given the extra flow over stock will I need a tune?

  • With the High Flow Catalytic Converters and free-flow tubing on these Kooks 1-3/4 in. Long Tube Catted Headers, a tune will be required in order to operate efficiently as well as eliminate the check engine light that will be cause by the O2 sensors.

Helpful (0)
Post Your Question
3 More Questions
Do they come with a ceramic coating? 1 answer
Does this need any other parts to fit properly to the kooks cat back? 1 answer
Do the high flow catalytic converters make enough of a difference in emissions testing to justify the loss of sound? Or is it better to go with non-catted headers for the extra sound. 1 answer

Customer Reviews (7) Write a Review

Overall Rating 5

out of 5 stars

Installation Time:Full Day

  • Performance Gain 4.428571 4.4
  • Fit 5 5

  • 5/5

    Installation Time: Afternoon

    March 16, 2018

    Kooks Long Tube Catted

    Sounds good and runs goods. Great product with great finishing. No issues with the product or delivery. Highly recommend.


    Year: 2015 Submodel: GT

    Helpful (4)

  • 5/5

    Installation Time: Weekend

    January 19, 2018

    Kooks long tube headers

    The headers transformed the car you can totally tell the difference I love them


    Year: 2017 Submodel: GT

    Helpful (4)

  • 5/5

    Installation Time: Afternoon

    December 16, 2017

    Kooks long tube catted

    I was hesitant but these fit like a glove. I had a shop do the install to ensure it was professionally installed, ran me 300$. This with the tune really woke up my mustang. You can really feel the power. Only downside are the cold starts in the a.m... it is super load but once idle is beautiful. I have borla stype cat back and it complements these headers perfectly.


    Year: 2016 Submodel: GT

    Helpful (5)

  • 5/5

    Installation Time: Full Day

    November 12, 2017

    kooks headers

    I put my mustang up on jack stands and started the process .It took me a full day but was worth it. car sounds great. Kooks headers are very good quality just like they say.


    Year: 2017 Submodel: GT

    Helpful (4)

  • 5/5

    Installation Time: Full Day

    January 23, 2017

    Awesome mod

    Guys Kooks long tube headers are a must-have mod for these cars they sound amazing and really woke the car up I can totally feel the change


    Year: 2016 Submodel: GT

    Helpful (6)

  • 5/5

    Installation Time: Afternoon

    May 10, 2016

    Take the Muzzle off 'your fire breathing Pony

    I had already installed the Ford Racing X Pipe on the otherwise stock exhaust. I noticed a difference in both sound and the speed that the engine would rev. It was entertaining for a month when I decided to go ahead and purchase the CAI, Tuner and Full Length Headers from Kooks. Like most, I researched before purchasing and decided that I would give Bama, JLT and Kooks a shot. The Headers were not quite as bad as I expected. The Headers fit right up to the Ford X Pipe and Stock exhaust. I was concerned that the 3 inch to 2.5 inch junction was going to be an issue, but the car breathes fine and the gains are very noticeable. I retained the stock mufflers thinking that they would maintain the less aggressive sound. I was wrong. The Factory Ford mufflers are quite un-restrictive once you eliminate the Factory Headers/Cats and Suitcase Muffler. They sound reminiscent of a 60's Mustang Track car. Raspy and ANGRY. Even with the Kooks Catted Headers, the car opens up at full throttle and sounds very close to a Track Beast. I swapped out the Performance Pack wheels and Pirelli's for more wheel and rubber. With the boost the car gets from the free flowing exhaust and intake, it still tortures the Michelin Pilots, even at 305-35/19 Don't be scared. Take a look at the instruction video from CJ Pony Parts, but buy your parts from American Muscle. The price and availability can't be beat. The gains are awesome at the mid to top end, and it gets there fast! Come on, American Muscle! You need less marketing videos and MORE "how to" videos!!!


    Year: 2015 Submodel: GT

    Helpful (7)

  • 5/5

    Installation Time: Full Day

    January 15, 2016


    Definitely recommend looks headers, you an really feel the difference and the sound, a lot meaner than before.


    Submodel: V6 Columbus

    Helpful (4)

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