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Kooks 1-5/8-Inch Long Tube Headers (96-04 GT)

Item 65526
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      Product Information

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


      • Increases RWHP and Torque
      • Long Tube Header Design with a 2.5 in. Collector
      • Free Flowing 1-5/8" Mandrel-Bent Tubing
      • 304 Stainless Steel Construction
      • TIG Welded for Strength
      • Fits 1996-2004 GT and Bullitt Mustangs


      More Horsepower and Torque. A set of Kooks Long Tube Headers will greatly improve the performance of your 4.6L GT or Bullitt Mustang. Kooks Headers feature an integrated venturi style collector that increases exhaust scavenging, and reduces turbulence to improve your 4.6's exhaust flow over the restrictive stock manifolds, boosting your Pony's horsepower and torque numbers.

      Quality Construction. Kooks Long Tube Exhaust headers are manufactured from 1-5/8" 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.

      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.

      Application. These Kooks Long Tube Headers are designed to fit the 1996-2004 4.6L GT and Bullitt Mustangs. Kooks long tube headers require the use of a Kooks shorty midpipe in order to be installed properly (see drop down option above). O2 Sensor extensions are included.


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

      Fitment: 1996 1997 1998 1999 2000 2001 2002 2003 2004 Details

      Kooks 11212000

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (3)

      Write a Review

      Ratings Summary

      3.7 out of 5 overall rating from 3 customers

      Installation Time: Weekend

      • February 17, 2020

        1 2001 GT - BDizzel

        What else do these headers Do?

        Do these headers also cook dinner for you every night? At this price, they should.

        Helpful (3)
      • December 09, 2018

        5 2000 GT - GeronimoH Installation Time: Weekend

        A little tough, but worth it

        The headers are worth any problems installing. The lack of a solid flange at the attachment points makes it necessary to finesse the bolt hole alignment for each bolt. Kooks header gaskets have failed twice on mine in only a few thousand miles. Lowering the k member is the best way to access the motor. Factory gaskets and locking header bolts are highly recommended. The steering column should have an aftermarket realignment modification installed. Mine has the Flaming River product. Also , you'll need 02 extensions to reattach the 02 sensors. Once you've installed a set of headers on these cars you'll be an expert.

        Helpful (4)
      • October 24, 2013

        5 2002 GT - AaronO Installation Time: Weekend

        What a Pain! But Good.

        Ok, the good. These headers arrived very quickly being sent overseas. Three days quick. A new record AM! The look and finish on them is amazing despite the fact that you'll never really see them again once they are on the car. The bad (or very irritating) - The directions that Kooks include with these are very basic. Very basic. Some of the steps they have if you follow make putting them in and tightening the bolts near impossible. Even after a call to Kooks the tech I spoke with said it is better to drop the K-member and use quality sleek tools. Having to "slightly pry" two of the tubes apart to get the steering column in is a joke. Better to disconnect the steering column underneath the steering wheel and slide it through said tubes and reconnect it. And lastly, the o2 extensions didn't even match the o2 sensors at the connection point. There are two tabs that are supposed to help guide it in and they didn't line up. I ended up breaking those tabs off, luckily had a clean break, and they slid right in. Overall, if you're more experienced at doing this work or are going to pay a shop to do it, they are worth the money. But, if you do it yourself, be prepared to deviate from some very poor instructions.

        Helpful (9)

      Questions & Answers (11 answers)

      5 Top Rated Questions

      Will this fit an automatic

      • This will fit automatic and manual transmissions.

      Helpful (0)

      Will they fit manual transmission?

      • They will fit both automatic and manual transmissions.

      Helpful (0)

      I would like to know if these headers would fit my Borla Stinger S-Type Cat-Back Exhaust

      • The Kooks 1-5/8 in. Long Tube Headers and required shorty mid-pipe will work the Borla Stinger S-Type Cat-Back exhaust without a problem.

      Helpful (0)

      I’ve heard that the pypes off road H pipe fits with kooks products, I was looking for an O/R kooks H pipe but can’t seem to find one to fit my 2002 mustang gt with these headers.

      • We cannot guarantee the Kooks 1-5/8 in. Long Tube Headers will fit with any Pypes products. We recommend keeping the same brand consistent through the exhaust set up to ensure proper fitment.

      Helpful (0)

      Do these headers come with the gaskets needed? Or will I have to buy anything else for the install

      • Yes, these Kooks 1-5/8 in. Long Tube Headers come with the gaskets, O2 extensions, and all installation hardware included!

      Helpful (0)
      Post Your Question
      6 More Questions
      Will these headers fit on a convertible? 1 answer
      would the kooks fit with the slp catted mid pipe fitted to borla stingers? 1 answer
      I have a 2001 Zinc Yellow Gt and it's on 2" lowering Springs all around, if I install these will they scrape on the floor ? I'm afraid that they will and I might have to go to stock height please let me know! Thank you. 1 answer
      i have hooker long tube header, they rotted out need replacement. was wonder if i need to change my mid pipe also when getting kooks?? mine has the 2 bolt flange as the kooks and bbk. which long tube would be best and save me $$$ ? 02 gt 4.6l 5 speed 1 answer
      I'm sure with a catted xpipe they will pass emissions, yes or no? 1 answer
      Do thee Kooks long tube headers fit automatic mustangs as well? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Driver side header
      • (1) Passenger side header

      Tech Specs

      Header Specifications
      Header Type: Long Tube Finish : Natural
      Type Mid Pipe Required: Shorty Fitment: 1996-2004 4.6L GT & Bullitt Mustangs

      Will It Fit My Mustang

      • Bullitt - 01
      • GT - 96, 97, 98, 99, 00, 01, 02, 03, 04