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Kooks 1-3/4 in. Long Tube Headers w/ Catted X-Pipe (07-10 GT500)

Item 65522
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      Product Information

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


      • Increase Rear Wheel Horsepower and Torque
      • Includes Long Tube Headers w/ Matching Catted X-Pipe
      • 304 Stainless Steel Construction
      • High Flow Catalytic Converters
      • Free Flowing Mandrel-Bent Tubing
      • Fits 2007-2010 Shelby GT500 Mustangs


      Improve Horsepower And Torque. The Kooks Long Tube Header and Catted Shorty X-pipe combo kit for the Shelby GT500 Mustang will balance out the exhaust pressure to increase flow over the restrictive stock 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 custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

      Application. This Kooks Long Tube Header and matching catted shorty X-pipe combo kit is designed specifically for the 2007 to 2010 Shelby GT500 Mustangs.

      Fitment: 2007 2008 2009 2010 Details

      MPN# 11322200


      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (5)

      Write a Review

      Ratings Summary

      5 out of 5 overall rating from 5 customers

      Installation Time: Weekend

      Installation Cost: $250-$500

      • August 02, 2019

        5 2007 GT500 - Sick500 Installation Time: Full Day

        2007 gt500

        pretty amazing! had a shop install this setup along with my flowmaster outlaws. pretty mean sounding. when you rev or get on it the sounds is would recommend for an awesome exhaust system

        Helpful (0)
      • April 06, 2017

        5 2008 GT500 - Venom7 Installation Time: Full Day

        Kooks headers and X pipe

        Awesome product! Put it on in a day and sounds absolutely MEAN! The power it brought to my 08 GT500 is more in the top end but definitely can feel the boost and everyone looks in aw when they hear it!

        Helpful (16)
      • December 11, 2016

        5 2009 GT500 - Crete Installation Time: Shop Install Installation Cost: $250-$500

        Good product, good price

        I had a local shop install this set up after they recommended Kooks because of the fitment and overall quality. I would say to anyone afraid to do headers with this mid pipe because they think they're too loud, they're not. In fact I'm using this car as a daily driver so I'll be going with a more aggressive axle back be for too long.

        Helpful (15)
      • August 13, 2016

        5 2008 GT500 - no

        2008 shelby

        I got the sound I was looking for. Iv'e had the look now it complete, looks, sound and speed what more could a man ask for

        Helpful (16)
      • November 09, 2014

        5 2009 GT500 - frank214365 Installation Time: Shop Install

        Kooks headers

        the Kooks headers and catted x pipe are a thing of beauty looks great have not installed them yet but I will soon

        Helpful (14)

      Questions & Answers (8 answers)

      5 Top Rated Questions

      Do you need to use O2 extenders?

      • The Kooks 1-3/4 in. Long Tube Headers w/ Catted X-Pipe will require the use of the supplied oxygen sensor extensions.

      Helpful (2)

      why have I had such a hard time putting these on my 2009 GT500? I had to put spacers in the front of the engine to clear the steering. the fitment is less then desirable to say the least.

      • We're very sorry to hear that you're having issues with your install! If you are having issues with installation, we would recommend speaking with a representative directly via chat, email, or phone.

      Helpful (0)

      Will this product pass an emissions testing for emission restrictive states, such as CA and NY?

      • Unfortunately this headers/x-pipe kit will not be CARB legal.

      Helpful (0)

      What is the OD of the output side of the X-pipe 2 1/2 " or 3" ? I want to hook it up to my cat-back Borla's.

      • The Kooks Header and Catted X-Pipe Combo will use a 3" X-pipe, but the section connecting to the cat back exhaust will neck down to factory size to allow fitment of stock catback exhausts, as well as catbacks designed to connect to the stock mid pipe.

      Helpful (0)

      Which diameter header is better for a 2007 gt500 the 1 3/4 or the 1 7/8.

      • You would be fine using either or. It really would depend on if you have any modifications done, or if you plan to do some modifications. The larger diameter would be best with some heavy modifications.

      Helpful (0)
      Post Your Question
      3 More Questions
      Does this come with the gaskets for the install? Will my factory pipes back to the mufflers work to finish the install? 1 answer
      will this work with the american thunder catback? 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • Kooks Long Tube Headers
      • Matching Kooks catted shorty X-Pipe
      • Necessary Gaskets
      • O2 Extensions

      Tech Specs

      Header Specifications
      Header Type: Long Tube Finish : 304 Stainless steel
      Type Mid Pipe Required: Kooks Shorty X Fitment: 2007-2010 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: "Yes" Fitment: 2007-2010 GT500

      Will It Fit My Mustang

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