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Kooks 1-5/8-Inch Long Tube Headers (05-10 GT w/ Automatic Transmission)

Item 65507
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      Product Information

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


      • Increases Rear Wheel Horsepower and Torque
      • Long Tube Header Design
      • Free Flowing 1-5/8" Mandrel-Bent Tubing
      • 304 Stainless Steel Construction
      • TIG Welded for Strength
      • Natural Finish
      • Fits 2005-2010 Automatic GT Mustangs


      More Horsepower and Torque. A set of Kooks Long Tube Headers will greatly improve the performance of your modular 4.6L 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 factory 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 2005-2010 4.6L GT Mustangs equipped with an automatic transmission. Kooks long tube headers require the use of a Kooks shorty midpipe in order to be installed properly (see drop down option above).


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

      Fitment: 2005 2006 2007 2008 2009 2010 Details

      MPN# 11312010

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (6)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 6 customers

      Installation Time: Full Day

      Installation Cost: $250-$500

      • December 10, 2018

        5 2006 GT - SteveB Installation Time: Afternoon

        Kooks long tube headers

        Very well built and made in USA . I don’t think you can buy a better built header . Thanks America muscle !

        Helpful (4)
      • February 15, 2018

        5 2005 GT - mikebev Installation Time: Full Day

        from shortys to long

        Never herd of kooks headers, Put shorties on did,ent make much difference. and i kept getting leaks. So got tired of that. Decided to go long,boy am i happy,Picked up 19HP an 14bft the sound is unbelievable. great move for me. AM give me everything i needed,thank you AM Mike

        Helpful (6)
      • December 27, 2017

        5 2006 GT - Tresleches Installation Time: Weekend


        You’ll get some abs if you do not have a lift I must say. Since the Christmas holiday did affect my time frame of installing the LT’s, it did indeed take a full weekend to install. But all worth it. If you have an extra 500 dollars laying around, pay someone to install them. Not your Average install like a CIA. Sound is awesome! Great product!

        Helpful (8)
      • August 25, 2014

        5 2007 GT - OZ1964 Installation Time: Shop Install Installation Cost: $250-$500

        Kooks LT

        I purchased the Kooks Long Tube Headers for my 2007 Mustang GT, I combinted this with a Kooks catted H-Pipe that I purchased from Brenspeed, since AM does not carry them. I had the LT's installed by Lamotta's in Longwood, FL, they did a great job with the install. I have the Kooks LT Headers, Kooks Catted H-Pipe connected to my Borla catbacks, the combination was flawless and the sound was amazing. I decided to go with the Catted H-Pipe over the X-Pipe since I prefer the strong and steady rumble of the H-Pipe over the rapsy X-Pipe. Performance gains were evident in the way the car launches and gets up to speed, it really moves and breathes much better, and the sound is amazing. I highly recommend Lamotta's for any install if your near Longwood, FL, they also handled my install for my Steeda CAI, Steeda Springs, Struts and Shocks.

        Helpful (11)
      • July 24, 2014

        5 2010 GT - njstang007 Installation Time: Full Day

        Amazing sound!!!

        Def sounds like mustang now! I added flowmaster outlaw mufflers so now I got the full sound of it. Kook headers def made gave the stang more horsepower. I would recommend this. Kook long tube headers are the way to go!

        Helpful (9)
      • July 18, 2014

        5 2005 GT - LT858 Installation Time: Afternoon

        Mustang Power

        Kooks long tube headers and xpipe should had been the first upgrade i made on my car. the headers with the xpipe combo give my car the retro muscle car sound it should have came with from the factory. not only can you hear the power being made, you can feel it now. back it behind a bama tune and you can't go wrong. best part it's made in the USA.

        Helpful (8)

      Questions & Answers (2 answers)

      2 Top Rated Questions

      Would theses long tube headers fit with the catted kooks h pipe?

      Would these headers fit a stock exhaust?

      • The Kooks Long Tube Headers - Automatic (05-10 GT) along with the matching Kooks Off-road X-pipe (05-10 GT w/ Long Tube Headers) item #65509 ( will fit with the stock exhaust. Both items from Kooks as well as the stock pipe size is 2.5" and will match up.

      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) Gaskets
      • (16) Small bolts
      • (8) Flat washers
      • (4) Long bolts
      • (4) Nuts

      Tech Specs

      Header Specifications
      Header Type: Long Tube Finish : 304 Stainless steel
      Type Mid Pipe Required: Kooks Shorty X Fitment: 2005-2010 GT - Automatic

      Will It Fit My Mustang

      • GT - 05, 06, 07, 08, 09, 10

      Fits automatic transmissions only

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