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Kooks Header and Off-Road X-Pipe Combo - 1-5/8 in. (99-04 GT)

1 Reviews
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  • Item #65529
  • MPN#11212000

  • Market Price $1,544.43
  • You Save 10% ($154.44)
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  • 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 1999-2004 GT and Bullitt Mustangs
Improve Horsepower And Torque. The Kooks Long Tube Header and Off-road Shorty X-pipe combo kit for the GT and Bullitt Mustang will balance out the exhaust pressure to increase flow over the restrictive stock factory exhaust system resulting in more horsepower, torque, and better throttle response.

Quality Construction. Manufactured from 1-5/8" 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 2.5" 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 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 1999-2004 4.6L GT and Bullitt Mustangs.

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

Fitment: 1999 2000 2001 2002 2003 2004 Details

Won't fit? Add an exception

What's in the Box
  • Kooks Long Tube Headers
  • Kooks off-road shorty X-Pipe
  • Necessary Gaskets
  • O2 Extensions
Installation Info
Will it fit my Mustang?
  • Bullitt - 01
  • GT - 99, 00, 01, 02, 03, 04

Customer Photos

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1 Questions / 1 Answers

Ask a Question

Will this fit the Manual coupe?

CJNOVA Year: 2004 Model: GT

  • This system fits a manual or automatic car

    Kooks Headers

    Good Answer (1)

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Customer Reviews (1) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Weekend

  • Performance Gain 5 5
  • Fit 5 5
  • Bang For Your Buck 5 5

  • 5/5

    Installation Time: Weekend

    May 14, 2013

    Great sound and horsepower gain.

    Installed on a 2003 Saleen S/C Car. Installation was crazy and almost impossible because of absolutely no clearance but after a whole lot of persistence they are finally installed. Without having it tuned yet I could feel the Horsepower gain and the sound is awesome. Would definitely recommend these headers and x-pipe but plan a weekend or longer for install.


    Year: 2003 Model: Other Driving Style: Show 'Stangs I have owned: 4 Chicago, IL, USA

    Helpful (3) (0)

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