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Kooks 1-7/8-Inch Long Tube Headers (11-14 GT500)

Item 102014
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      Product Information

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


      • Increases RWHP and Torque
      • Long Tube Header Design
      • Free Flowing 1-7/8" Mandrel-Bent Tubing
      • 304 Stainless Steel Construction
      • TIG Welded for Strength
      • Natural Finish
      • Fits 2011-2014 Shelby GT500 Mustangs


      More Horsepower and Torque. A set of Kooks Long Tube Headers will greatly improve the performance of your Shelby GT500 Mustang. Kooks Headers feature an integrated venturi style collector that increases exhaust scavenging, and reduces turbulence to improve your GT500's exhaust flow over the restrictive factory manifolds, boosting your Pony's horsepower and torque numbers.

      Quality Construction.
      Kooks Long Tube Exhaust headers are manufactured from 1-7/8" mandrel bent 304 stainless steel tubing for superior airflow. These headers are TIG welded and feature a leak-free ball flange design for optimal performance and a better than OEM fit. Stainless steel hardware and gaskets are included.

      Natural Finish.
      These Kooks Headers feature a natural stainless steel finish, which provides an aggressive appearance to your engine bay. This is not a heat-resistant coating.

      Recommended Upgrade. To realize the full power potential that these Long Tube Headers have to offer, AmericanMuscle recommends a custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

      These Kooks Long Tube 1-7/8" Headers are designed to fit the 2011-2014 Shelby GT500 Mustangs. Kooks long tube headers require the use of a Kooks shorty midpipe in order to be installed properly (see drop down option above).


      Technical Note: This Kooks product is intended for off road use, and is not legal for use in emission restrictive states.

      Fitment: 2011 2012 2013 2014 Details

      MPN# 11422400

      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: Full Day

      • March 12, 2018

        5 2014 GT500 - Erikbaseball1 Installation Time: Full Day

        Great product

        I was a little hesitant on buying these simply because of the price, but man is it worth it super high quality design. Came with bolt lockers to prevent the header bolts from backing out, very well thought of by kooks. It is a very tight fit and you have to drop the sub frame but it’s doable, I did mine myself I took my time and it took me 2 days. I got a tune by Lund racing and man it’s a different world. These long tube headers really woke the car up I am severely impressed with the horsepower and really impressed with the low end torque gains.

        Helpful (9)
      • May 11, 2017

        5 2014 GT500 - Projectcar Installation Time: Full Day


        The best or nothing kooks all day! Worth the money

        Helpful (7)
      • March 02, 2017

        5 2014 GT500 - PaulG Installation Time: Weekend

        bought for 2014 gt500

        Performance is excellent as is the sound. Dont even try to install this on jackstands. Requires lowering suspension components etc and even with a lift it still took 1.5 days. Best upgrade so far! You will not be disappointed. Didn't even throw a CEL. Great stuff. Worth every penny.

        Helpful (10)
      • December 15, 2015

        4 2011 GT500 - slowsvt Installation Time: Full Day

        2011 gt500 kooks headers

        Awesome set of headers and great product to maximize horsepower output

        Helpful (7)

      Questions & Answers (1 answers)

      1 Top Rated Question

      I see 1-3/4in and 1-7/8 what is the difference between them? Which size would give the best performance boost?

      • The difference would be in the diameter of the actual tubing used on the headers. Depending on if you are running a naturally aspirated or forced induction set up will help determine that best setup in regards to performance.  

      Helpful (0)
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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Driver side header
      • (1) Passenger side header
      • (2) Header Gaskets
      • Installation hardware

      Tech Specs

      Header Specifications
      Header Type:Long Tube Finish :304 Stainless steel
      Type Mid Pipe Required:Kooks Shorty XFitment:2011-2014 GT500

      Will It Fit My Mustang