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

Item 404497
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Market Price $2,648.99 You Save 12% ($305.39)
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$2,343.60 (each)

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      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • 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

      MPN# 1151H431

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (4)

      Write a Review

      Ratings Summary

      4.8 out of 5 overall rating from 4 customers

      Installation Time: Weekend

      Installation Cost: $500-$1000

      • January 11, 2020

        5 2017 GT - Halfbad85 Installation Time: Afternoon

        Headers are great.

        These headers are a great purchase and the installation was surprisingly simple. They do however require a o2 extension for the passanger side upstream sensor despite what some may say

        Helpful (0)
      • June 06, 2019

        4 2017 GT - Aricvv Installation Time: Full Day


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

        Helpful (0)
      • April 05, 2019

        5 2018 GT - AlexB Installation Time: Shop Install Installation Cost: $500-$1000

        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.

        Helpful (0)
      • June 20, 2018

        5 2017 GT - CharlesA Installation Time: Weekend

        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.

        Helpful (10)

      Questions & Answers (14 answers)

      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 (4)

      Will these work fine with Corsa extreme cat-back exhaust system

      • Yes, these headers will work with the Corsa exhaust

      Helpful (0)

      I want to keep the stock exhaust on my 2019 Mustang GT. Will these headers fit the stock exhaust? or do I need a certain mid pipe? and if so which ones?

      • The Kooks 1-7/8 in. Long Tube Green Catted Headers are compatible with the 15'-20' Mustang GT but will require minor modification for these headers to fit the factory exhaust system.

      Helpful (0)

      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)
      Post Your Question
      9 More Questions
      Will this connect to a 3" Borla type S catback? 1 answer
      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? 1 answer
      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

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Long Tube Catted Headers
      • Mounting Hardware