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

Item 404497
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Market Price $2,648.26 You Save 12% ($304.66)
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$2,343.60 (each)

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    Features & Details

    • Long Tube Catted Headers
    • Maximize the Removal of Exhaust Gases from Cylinders Better Than Stock
    • Mandrel Bent 1-7/8 Inch Diameter Primary Tubes
    • Three-Inch Collector Assembly
    • Ideal for Use in Any Regions That Have Not Incorporated Carb Emissions Standards
    • Limited Lifetime Warranty
    • Hard Degree of Difficulty Installation
    • Compatible with the 2015-2020 Ford Mustang GT

    Outstanding Optimized Exhaust System. For one of the finest exhaust systems on the off-road, look no further than the Kooks 1-7/8 Inch Long Tube Green Catted Headers. These high-flow long tube headers maximize the removal of exhaust gases from your cylinders better than stock with its mandrel-bent 1-7/8 inch diameter primary tubes and 3 inch collector assembly to move gases to your catalytic converters with increased efficiency.

    Passes Emissions Tests. This exhaust system fully optimizes and passes emissions testing with effective work running your exhaust gases towards catalytic converters, converting them into less toxic gases. This makes it ideal for use in any regions that have not incorporated CARB-emissions standards.

    Warranty. Kooks guarantees your product is free from defects in materials and workmanship with a limited lifetime warranty. Damage as a result of abuse or neglect will not be covered.

    Installation. Handy people can install this product with a hard level of complexity, upwards of a day to complete with all required mounting hardware in the package.

    Application. The Kooks 1-7/8 Inch Long Tube Green Catted Headers are compatible with the 2015-2020 Ford Mustang GT.

    Fitment: 2015 2016 2017 2018 2019 2020 Details

    MPN# 1151H431

    CA Residents: WARNING: Cancer and Reproductive Harm -

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

      Customer Photos (2) Submit Your Photo

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        Questions & Answers (12)

        5 Top Rated Questions

        What is the difference between the green catted headers version of these long tubes and the "normal" catted Kooks 1-7/8 in long tubes? Power wise? Are these better for passing emission tests?

        • The Green cats are designed to meet EPA regulations, keep CEL lights from showing and not loose power from using cats.

        Helpful (3)

        Do these headers work with factory o2 sensors or will i need o2 sensor extension? If i need the extension can I use the BBK extensions with factory o2 sensors? Thanks

        • These do not require an O2 extension.

        Helpful (0)

        Can I use these 1-7/8 green catted on my full NA built up or these are only used for superchargers setup?

        • These will work on a NA build, however will not benefit from the wider diameter tubing as much as a forced induction setup will.

        Helpful (0)

        Will this connect to a 3" Borla type S catback?

        • Yes this would indeed be compatible with the 3 inch Borla Cat Back System.

        Helpful (0)

        Hello I currently have the Corsa Extreme catback exhaust on my 2017 mustang gt. Will I need any other mip pipe attachments for these headers?

        • No additional exhaust components will be required.

        Helpful (0)
        Post Your Question
        7 More Questions
        Do these headers produce a different amount of emissions compared to the series headers? 1 answer
        How do these headers affect the sound? Is it still louder than stock and as load as Kooks‘ offroad catted headers? 1 answer
        Do these require an O2 extension like the BBK headers? if so, what extension will work? 1 answer
        Will these headers make the check engine light come on in my 2016 GT? 1 answer
        Will these work on the 18 Roush catback? 1 answer
        Will these require a tune or tune revision? 1 answer
        Will these bolt up to the aftermarket corsa extreme cat-back? Are there any other modifications needed? 1 answer

          Customer Reviews (3) Write a Review

          Overall Rating 4.7

          out of 5 stars

          Installation Time:Weekend

          Installation Cost:$500-$1000

          • Loudness / Volume 4.333333 4.3
          • Exhaust Note 5 5
          • Fit & Finish 5 5
          • Bang For Your Buck 5 5

          • 4/5

            Installation Time: Full Day

            June 06, 2019


            Really excited. The craftsmanship was superb and these will sound awesome


            Year: 2017 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $500-$1000

            April 05, 2019

            Worth the money

            I purchased the headers to complete the full exhaust on my mustang. I was extremely sastified with my purchase. The car sounds even more aggressive which I did not believe to be possible.


            Year: 2018 Submodel: GT

            Helpful (0)

          • 5/5

            Installation Time: Weekend

            June 20, 2018

            Top Notch!!

            These are very well designed. The notched header flanges allow the installation of all the top header bolts and hold the gasket in place while you slid the header into place. Install the bottom bolts, torque to specs and done! Great product and the only catalytic converters that Kooks will warranty with a supercharger.


            Year: 2017 Submodel: GT

            Helpful (10)