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Kooks 1-7/8 in. Long Tube Catted Headers (15-19 GT)

Market Price $2,040.99 You Save 12% ($236.25)
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$1,804.74 (each)

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  • Item 404496

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    Features, Video & Details

    • Long Tube Catted Headers
    • Aggressive Throaty Sound
    • Small Gains in Horsepower and Torque
    • Mandrel Bent, 1 7/8 Inch, 304 Stainless Steel Tubing
    • Scavenger-Spiked Collectors
    • Precise OEM Quality Fit
    • For Off-Road Use Only
    • Limited Lifetime Warranty
    • Hard Degree of Difficulty Installation
    • Compatible with the 2015-2019 Ford Mustang GT

    Review & Installation Video

    Review & Install Video

    Long Tube Header Design by Kooks. The Kooks 1-7/8 Inch Long Tube Catted Headers deliver outstanding exhaust flow, resulting in an aggressive throaty sound and small gains in horsepower and torque for your vehicle.

    Built to Perform. This product is made to last, constructed using 1 7/8 inch, 304 stainless steel tubing, which is mandrel bent, connecting with scavenger-spiked collectors to deliver innovative airflow with a precise OEM quality fit. It is designed for off-road use only, not for use on regulated vehicles.

    Warranty. Rest assured with a limited lifetime warranty from Kooks, which protects against defects in materials and workmanship.

    Installation. It takes roughly a day to install this product with a hard level of difficulty. Given the level of complexity, it is highly advised to visit a professional installer or auto service center for assistance.

    Application. The Kooks 1-7/8 Inch Long Tube Catted Headers are compatible with the 2015-2019 Ford Mustang GT.

    Fitment: 2015 2016 2017 2018 2019 Details

    MPN# 1151H421

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • Long Tube Catted Headers
    • Mounting Hardware
    Installation Info
    Will it fit my Mustang?

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    Questions & Answers (14)

    5 Top Rated Questions

    Are you sure these will fit a 2018 GT? Have you installed them on a 2018 GT?

    • Yes, these headers will fit the 2018 GT Mustang without a problem. We did test fit these headers on a 2018 GT Mustang as well and confirmed with Kooks to be sure of the fitment for the 2018 model Mustangs.

    Helpful (1)

    Does this come with the pair of headers or just one side for the price? Website says (each) instead of pair.

    • These are priced for both sides.

    Helpful (0)

    What resonator delete X pipe would you recommend with these headers, that is a direct fit? I am only looking for the X pipe, not a full cat-back system. Thanks

    • We recommend the Ford Performance Cut and Clamp Resonator Delete X-Pipe with this set of headers.

    Helpful (0)

    Are these compatible with the magna flow competition cat back exhaust?

    • The Kooks 1-7/8 in. Long Tube Catted Headers will not be a direct fit with the MagnaFlow Competition Cat-Back Exhaust. You will need to purchase a "shorty" mid-pipe or modify your existing mid-pipe to properly fit with the extended length header. (Minor cutting or flaring my be required to connect the pieces).

    Helpful (0)

    1. What is the max hp this header is rated up to? 2. Will this fit seamlessly with the corsa extreme cat-back exhaust system with the double x-pipe?

    • The Kooks 1-7/8 in. Long Tube Catted Headers does not carry a maximum horsepower rating. This will be a direct bolt on with the Corsa Extreme cat-back and double x-pipe.

    Helpful (0)
    Post Your Question
    9 More Questions
    Would these fit with the Corsa extreme catback on a 2016 mustang gt 1 answer
    This Fit Premium 2017 Mustang GT with Automatic trasmission. 1 answer
    What the difference between these cats and the green cats? 1 answer
    Will these headers require a tune and void the warranty of my 2018 5.0? 1 answer
    Will they fit with a Borla ATAK cat-back system with the X-pipe ? 1 answer
    Will these catted headers keep me legal in PA when it comes time for emissions testing? 1 answer
    Are these high flow catted? And are they good with a pro charger engine? 1 answer
    I plan on purchasing a Corsa Extreme Cat-back exhaust system for my 2015 mustang Fastback. Are these a good fit or would i have to go with something else? 1 answer
    Is this CA legal 1 answer

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    Customer Reviews (5) Write a Review

    Overall Rating 5

    out of 5 stars

    Installation Time:Weekend

    Installation Cost:$500-$1000

    • Loudness / Volume 5 5
    • Exhaust Note 5 5
    • Fit & Finish 4.6 4.6
    • Bang For Your Buck 4.6 4.6

    • 5/5

      Installation Time: Weekend

      December 03, 2018

      Awaken The Beast!

      The sound of these headers are amazing. I already had the Borla S-Type with an X-pipe which made the car sound aggressive. Then you pair it with these headers and now it sounds like a monster! If you are doing this yourself make sure you have at least 10 hours to spend putting these in if you are using jack stands. They are a pretty big pain especially the driver side. You will definitely have some issues getting the bolts in due to the lack of space from the design of these headers. You will definitely have a love hate relationship after you are done with the install. I also want to make it very clear THESE ARE NOT A DIRECT FIT WITH THE BORLA X-PIPE!!! If you call and ask American Muscle they will say it fits. It even says it fits on the QandA for these headers that it is a direct fit. After about 5 calls finally and 5 different people finally they said “Yeah you will need a Kooks mid pipe to make these work” The step down will not fit the mid pipe at all. And the angel from the step downs are on are completely off. I had to have someone make me some turn downs so I could drive it to the shop so they could fabric some new step downs to make this system line up. So just keep that in mind if you are buying these headers. Once I got through the run around from support and got the car to the shop to have it finished, I LOVE these headers!


      Year: 2017 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      December 03, 2018

      Perfect match

      This is the best product possible. Great horsepower gains and removes some boost for better track results on supercharged applications. This is extremely involved to put on yourself. Requires specialty tools lift recommended. But.....well worth the effort if you know what your doing. If you have the money get the proffessional install!!


      Year: 2015 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Full Day

      November 23, 2018

      Sounds great

      These headers sound great paired with my Corsa Extreme exhaust. The power gains are there along with my other bolt on mods. Highly recommend


      Year: 2017 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      October 03, 2018

      awesome headers

      These headers sound great. The power increase was awesome. They are very loud paired with my Corsa sport exhaust.


      Year: 2018 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Full Day

      May 21, 2018

      Awesome and worth it

      Felt the gains in power and sound immediately after installing them, even before the tune. They come with everything you need to install them including some pretty awesome Stage 8 hardware. Would buy these again in a heartbeat. These are a a good challenge to install, definitely put aside at least a full day to get these on.


      Year: 2016 Submodel: GT

      Helpful (10)

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