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Kooks Green Catted X-Pipe (11-14 GT w/ Long Tube Headers)

Market Price $1,301.99 You Save 12% ($150.67)
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  • Item 390857-A

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    Features & Details

    • Improves Exhaust Flow
    • Raspy Race Car Growl
    • High Flow GreenCat Catalytic Converters
    • 3" to 2.75" Mandrel-Bent Tubing
    • 304 Stainless Steel Construction
    • Intended for Off-Road or Track Use Only
    • Required for Kooks Long Tube Headers
    • Fits 2011-2014 GT Mustangs
    Optimize Performance. Get the performance boost you crave for your GT Mustang while staying EPA friendly with a Kooks Green Catted X-Pipe. Designed for use with Kooks Long Tube Headers, this X-pipe features two Kooks Ultra High Performance Green Catalyst Converters for less restriction. Without robbing horsepower, the EPA-compliant system works on applications up to 800hp and handles exhaust temperatures as high as 1500F.

    Race Car Growl. The Kooks X-Pipe not only increases the power of your Mustang, but it also changes its sound as well. The modern X crossover design of this Kooks Mid Pipe will add a loud raspy, race car style growl to the sound of your exhaust. While being louder than stock, the sound is not overbearing or obnoxious.

    Green Catalytic Converters. GreenCats are Kooks ultra high performance green catalytic converters. Kooks specifically designed these Catalytic Converters to meet stringent EPA Federal Emissions Standards. Able to handle exhaust temperatures of up to 1500F, these GreenCats work exceptionally well on both force inducted and naturally aspirated Mustangs. GreenCats have a 90% success rate of eliminating emission related "Check Engine Light" issues.

    Quality Construction. Kooks proudly manufactures their Exhaust Systems right here in the USA. This Kooks Long Tube X-Pipe is constructed from free flowing CNC mandrel-bent 304 stainless steel for optimal exhaust flow.

    Application. This Kooks Shorty Green Catted X-Pipe is specifically designed to fit the 2011-2014 5.0L GT Mustangs with Kooks Long-Tube Headers installed. The 3" step down to a 2.75" outlet allows for use of the OEM catback exhaust system.

    Technical Note. This product is not legal for use in California or any other state adopting California emission standards. Not legal for use on pollution controlled motor vehicles; intended for off road use only.

    Fitment: 2011 2012 2013 2014 Details

    MPN# 11413300

    CA Residents: WARNING: Cancer and Reproductive Harm -

    What's in the Box
    • (1) X-Pipe
    • (2) Catted Down Pipes
    • (2) Clamps
    Installation Info
    Tech Specs
    Style Mid Pipe: Shorty "X" Type Headers Required: Kooks Long Tube
    Piping Material: 304 Stainless Steel Piping Size: 3"
    Catalytic Converter: "Yes" Fitment: 2011-2014 5.0 GT Mustangs
    Will it fit my Mustang?

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    Questions & Answers (3)

    3 Top Rated Questions

    Will this remove a check engine light? My setup is borla long tube headers and borla atak exhaust

    • The Kooks Green Catted X-Pipe will prevent p0420 and p0430 catalyst efficiency codes. This kit is for use with Kooks long tube headers only, and would not work with Borla headers.

    Helpful (0)

    hi there, I own a 2013 boss 302 laguna seca, so when i order this x-pipe, will i get the same as shown in pictures or the boss 302 version which has side openings for the boss 302 side exhaust? thanks.

    • The Kooks Green Catted X-Pipe will come as shown in the picture without the cutouts.

    Helpful (0)

    Will this fit the borla atak catback exhaust fora 2014 gt?

    • This will fit with the Borla ATAK catback exhaust however since the Borla ATAK has an X-Pipe assembly that comes with the catback as well as the size of the pipe being 2.75" instead of the 3" of the Kooks Green Catted X-Pipe, some modification will be required.

    Helpful (0)
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    Customer Reviews (1) Write a Review

    Overall Rating 4

    out of 5 stars

    Installation Time:Afternoon

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

    • 4/5

      Installation Time: Afternoon

      May 20, 2017


      Great sound. Love the way it looks under the car as well.


      Year: 2014 Submodel: GT

      Helpful (8)