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Kooks 3-Inch to 2.50-Inch GREEN Catted X-Pipe (07-10 GT500 w/ Long Tube Headers)

Item 390856
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      Product Information

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


      • 3" Durable 304 Stainless Steel Construction
      • Kooks High Flow GreenCat Catalytic Converters
      • Connects to 2.5" Factory Exhaust
      • Performance, Deep Tone and EPA Certified
      • Works on Applications up to 800 horsepower
      • Withstands Temperatures up to 1500 Degrees
      • Made with Pride in the USA
      • Fits 2007-2010 Shelby GT500 Mustangs w/ Kooks Long Tube Headers


      For the Ultimate in Performance. Kooks offers a great performance advantage over stock with their GREEN Catted X-Pipe. The mandrel-bent T304 stainless steel X-pipe connects to two ultra-high performance GREEN catalysts for minimal exhaust restriction while maintaining EPA compliance. This is the set you need with your Kooks long-tube headers.

      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.

      Built to Last While Going Fast. High-quality T304 stainless steel is mandrel-bent by Kooks to make the smoothest exhaust path possible. This X-Pipe allows you to retain the stock 2.5" tailpipe and muffler on your GT500. This X-Pipe is made in the USA and covered under Kook's limited lifetime warranty.

      Easy, Bolt-On Installation. The Kooks GREEN Catted X-Pipe is a bolt-on application that does not require welding, cutting or drilling. The X-Pipe bolts up to Kooks 3" Long Tube Headers clamping to the existing 2.5" OEM exhaust system. All of the required mounting hardware is provided.

      Application. This Kooks Green Cat Catted X-Pipe with is specifically designed to fit the 2007 to 2010 Shelby GT500 Mustangs equipped with the supercharged 5.4L V8 engine. This X-Pipe is intended to be installed with 3" Kooks Long-Tube Headers.

      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. These Headers are intended for left hand drive applications only.

      Fitment: 2007 2008 2009 2010 Details

      MPN# 11323300

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (1)

      Write a Review

      Ratings Summary

      5.0 out of 5 overall rating from 1 customers

      Installation Time: Afternoon

      • January 27, 2017

        5 2014 GT - Mdecquir Installation Time: Afternoon

        Amazing !!!

        The product can't speak for itself much more. It does exactly what's its intended to do. Great power and the sound is better than anything I've ever heard. Looking for a deep sound this is a must have item added to your s550.

        Helpful (8)

      Questions & Answers (1 answers)

      1 Top Rated Question

      Anyone in RI have luck with these cats? Been on the fence awhile about getting longtubes, just hate to pull the trigger then can't get a sticker.

      • Hi, This Kooks GREEN Catted X-Pipe - 3 in. to 2.5 in. is listed as 49 State EPA Legal, and not legal in the state of California they do NOT meet CARB compliance.

      Helpful (0)
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      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Catted X-Pipe Assembly

      Tech Specs

      Mid Pipe Specifications
      Style Mid Pipe: Shorty "X"Type Headers Required:Long Tube
      Piping Material:304 Stainless SteelPiping Size:3"
      Catalytic Converter:"Yes"Fitment:2007-2010 GT500 Mustangs

      Will It Fit My Mustang

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