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Kooks 1-7/8 in. Long Tube Catted Headers (15-20 GT)

Market Price $2,159.68 You Save 12% ($248.45)
Our Price

$1,911.23 (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 2015-2020 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 2015-2020 Ford Mustang GT.

    Fitment: 2015 2016 2017 2018 2019 2020 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?

      Customer Photos (1) Submit Your Photo

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        Questions & Answers (27)

        5 Top Rated Questions

        I have the corsa double helix mid pipe and the roush exhaust. Will this kit be able to be matted to that set up or do I need to look for corsa headers even though they don't offer a catted version of their headers?

        • With the Corsa mid-pipe, we recommend the Corsa headers and adapter pipes as they are designed to work with that specific mid-pipe. Unfortunately we have not tested the Kooks headers with the Corsa mid-pipe, so we would be unable to guarantee fitment.

        Helpful (2)

        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)

        Will these negatively impact results from adding the power pack 2?

        • The power pack tune would no longer be applicable and a new custom tune would be needed to use these headers. lt would not negatively impact the throttle body or cold air intake.

        Helpful (0)

        Do these headers fit the Armytrix Catback Exhaust?

        • Unfortunately we have not tested these headers with the Armytrix Cat-back Exhaust, so we would be unable to guarantee fitment.

        Helpful (0)

        Does this fit on item no 390228 ? Ford preformance by borla sport catback

        • Yes those two products are compatible.

        Helpful (0)
        Post Your Question
        10 More Questions
        Will these fit with a Outlaw Cat Back Exhaust System? 2015 model 1 answer
        will these headers work with the stock exhaust? 1 answer
        I have 2019 mustang Gt will these fit with borla ATAK cat back. 1 answer
        I’m confused as to why having a catted version, still will not pass CA emissions. Are there any catted headers that do pass CA emissions? 1 answer
        Would this be compatible with the, Mishimoto Cut and Clamp Resonator Delete H-Pipe (15-19)??? Hoping it’d sound great. Thanks 1 answer
        do you need a tune with these long tube headers? 1 answer
        any reason why these wouldn't connect to a mac prochamber? 1 answer
        Will these headers fit a 2.5 inch borla catback without modification to the x pipe? 1 answer
        Will these headers be compatible with the AEW track edition catback exhaust? 0 answer
        Does this come with the pair of headers or just one side for the price? Website says (each) instead of pair. 1 answer

          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 (7)

          • 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 (8)

          • 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 (7)

          • 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 (11)