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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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    Features & Details

    • 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



    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • Kooks Long Tube Headers
    • Matching Kooks catted shorty X-Pipe
    • Necessary Gaskets
    • O2 Extensions
    Installation Info
    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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        Questions & Answers (8)

        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

          Customer Reviews (5) Write a Review

          Overall Rating 5

          out of 5 stars

          Installation Time:Weekend

          Installation Cost:$250-$500

          • Loudness / Volume 4.5 4.5
          • Exhaust Note 4.5 4.5
          • Fit & Finish 4.5 4.5
          • Bang For Your Buck 4 4

          • 5/5

            Installation Time: Full Day

            August 02, 2019

            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


            Year: 2007 Submodel: GT500

            Helpful (0)

          • 5/5

            Installation Time: Full Day

            April 06, 2017

            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!


            Year: 2008 Submodel: GT500

            Helpful (16)

          • 5/5

            Installation Time: Shop Install

            Installation Cost: $250-$500

            December 11, 2016

            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.


            Year: 2009 Submodel: GT500

            Helpful (15)

          • 5/5

            August 13, 2016

            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


            Year: 2008 Submodel: GT500

            Helpful (16)

          • 5/5

            Installation Time: Shop Install

            November 09, 2014

            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


            Year: 2009 Submodel: GT500 Sherman Oaks, Los Angeles, CA, USA

            Helpful (14)

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