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Kooks Header and Off-Road X-Pipe Combo - 1-3/4 in. (11-14 GT500)

AmericanMuscle no longer carries the Kooks Header and Off-Road X-Pipe Combo - 1-3/4 in. (11-14 GT500). Please check out 2010-2014 Mustang Exhaust Combos for an updated selection.

Features, Video & Details

  • Increase Rear Wheel Horsepower and Torque
  • Includes Long Tube Headers w/ Matching Off-Road X-Pipe
  • 304 Stainless Steel Construction
  • For Off-Road, Track Use
  • Free Flowing Mandrel-Bent Tubing
  • Fits 2011-2014 Shelby GT500 Mustangs

Review & Installation Video

Review & Install Video

Improve Horsepower And Torque. The Kooks Long Tube Header and Off-road Shorty X-pipe combo kit for the Shelby GT500 Mustang will balance out the exhaust pressure to increase flow over the restrictive factory exhaust system resulting in more horsepower, torque, and better throttle response.

Quality Construction. Manufactured from 1-3/4" mandrel bent 304 stainless steel tubing Kooks Long Tube Headers are TIG welded for strength, and feature a leak-free ball flange design to fit perfectly into the included 3" diameter 304 stainless steel Shorty X-pipe for excellent exhaust flow and performance.

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, AmericanMuscle recommends the use of Exhaust Heat Wrap for high performance applications.

Recommended Upgrade. To realize the full power potential that this Kooks Long Tube Header and X-pipe Kit has to offer, AmericanMuscle recommends a Bama custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

Application. This Kooks Long Tube Header and matching off-road shorty X-pipe combo kit is designed specifically for the 2011 to 2014 Shelby GT500 Mustangs.

Technical notes. Not legal for use on pollution controlled motor vehicles; intended for off road use only.

Fitment: Details

CA Residents: WARNING: Cancer and Reproductive Harm -

What's in the Box
  • (1) Driver side header
  • (1) Passenger side header
  • (2) Gaskets
  • (16) Small bolts
  • (8) Flat washers
  • (4) Long bolts
  • (4) Nuts
  • (1) X-pipe
  • (2) Down pipes
  • (2) Clamps
Installation Info
Tech Specs
Header Specifications
Header Type: Long Tube Finish : 304 Stainless steel
Type Mid Pipe Required: Kooks Shorty X Fitment: 2011-2014 Shelby GT500

Mid Pipe Specifications
Style Mid Pipe: Shorty "X" Type Headers Required: Kooks Long Tube
Piping Material: 304 Stainless Steel Piping Size: 3"
Catalytic Converter: "NO" - For off-road use only Fitment: 2011-2014 Shelby GT500
Will it fit my Mustang?

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        Customer Reviews (4) Write a Review

        Overall Rating 5

        out of 5 stars

        Installation Time:Weekend

        Installation Cost:0-$100

        • Performance Gain 5 5
        • Fit 4.75 4.8

        • 5/5

          Installation Time: Shop Install

          Installation Cost: 0-$100

          June 08, 2018

          What a sound!!

          My 2013 already sounded pretty mean but with the full Kooks exhaust - headers to tail pipe,'s just NASTY!


          Year: 2013 Submodel: GT500

          Helpful (9)

        • 5/5

          June 22, 2017

          Excellent product

          This is the best headers and x-pipe in the market. I had numerous of different ones and this is by far the best. If you're looking for a nice louder sound for your beast this is the product to go to highly recommended


          Year: 2012 Submodel: GT500

          Helpful (11)

        • 5/5

          Installation Time: Weekend

          November 17, 2016

          Loud Shelby

          I wanted to get something that had a extremely deep aggressive tone to the car and I looked at all the other headers and I finally made a decision on these headers and OMG is this loud even with the stock mufflers is so loud and its already 10times faster I plan on getting a tuner for my car but what a difference


          Year: 2014 Submodel: GT500

          Helpful (12)

        • 5/5

          Installation Time: Full Day

          May 27, 2013

          GT500 Kooks Headers & Off road X-pipe

          Install took a day. After the install, started the car, and WOWWWWWW!!!!! Sounded soooo much meaner and louder with this setup. LOVE IT!!!


          Year: 2011 Submodel: GT500 Chicago, IL, USA

          Helpful (12)

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