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Kooks 1-5/8-Inch Long Tube Headers with Catted X-Pipe (05-10 GT w/ Manual Transmission)

Item 65500
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      Review & Installation Video

      Product Information

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


      • Increase Rear Wheel Horsepower and Torque
      • Includes Headers w/ Matching Catted X-Pipe
      • 304 Stainless Steel Construction
      • High Flow Catalytic Converters
      • Free Flowing Mandrel-Bent Tubing
      • Fits 2005-2010 Manual GT Mustangs


      Improve Horsepower And Torque. The Kooks Long Tube Header and Catted Shorty X-pipe combo kit for the manual 2005 to 2010 GT Mustangs will balance out the exhaust pressure to increase flow over the restrictive factory exhaust system resulting in more horsepower, torque, and better throttle response.

      Quality Construction. Manufactured from 1-5/8" 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 2.5" diameter 304 stainless steel Shorty X-pipe for excellent exhaust flow and performance.

      Recommended Upgrade. To realize the full power potential that this Header and X-pipe combo 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 Header and matching catted X-pipe combo kit is designed specifically for the 2005 to 2010 4.6L GT and Bullitt Mustangs equipped with a manual transmission. Includes gaskets and 02 extensions.

      Fitment: 2005 2006 2007 2008 2009 2010 Details

      MPN# 11313200




      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (34)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 34 customers

      Installation Time: Weekend

      Installation Cost: $250-$500

      • March 15, 2020

        5 2010 GT - JohnZ Installation Time: Less than 1 Hour

        Cant go wrong with LTHs

        Headers went in very easy got the whole job done in an hour and a half (professional mechanic). Fitment was great and they sound amazing teamed up with the MBRP axle back. All I can say is cant go wrong with Kooks Long Tube Headers

        Helpful (1)
      • January 28, 2020

        5 2007 GT - Hoss07 Installation Time: Full Day

        Nice rumble

        Excellent fit. So happy I bought these. Paired these with the roush cat back and she screams when you punch it! And the power gains and definitely noticable. Oh and increase in mpg when I dont floor it everywhere I go haha

        Helpful (1)
      • September 05, 2019

        4 2009 GT - Tony Installation Time: Weekend


        Amazing sound after installation, very loud!!!! Only complain I have is when I was installing them 2 of the bolts where a pain in the neck to install because the header was in the way

        Helpful (0)
      • August 16, 2019

        5 2008 GT - hwhalerfan79 Installation Time: Shop Install

        Amazing sound, amazing performance

        It has only been a few days but the difference is night and day. At idle, the change is subtle. When you lay on it boy does it wake up. It tough to judge the gains as I had gears done at the same time but overall I'm more than pleased with the outcome. Highly recommend.

        Helpful (0)
      • April 23, 2019

        5 2005 GT - DougB Installation Time: Full Day

        Went from O/R x pipe to these

        It's obviously quieter than an "off-road" setup but it still has a great deep tone and made my car legal in VA. Went with Kooks for the fitment and quality of the pipes, great sounding setup.

        Helpful (0)
      • March 13, 2019

        5 2008 GT - RobertC Installation Time: Weekend

        new sound

        great sound.easy install for a novice. it took a few days

        Helpful (1)
      • February 11, 2019

        5 2005 GT - Brendan96 Installation Time: Weekend


        They sound amazing. Don't go with any other header, worth the price.

        Helpful (3)
      • January 07, 2019

        5 2008 GT - Somar Installation Time: Afternoon

        Oh my goodness

        I love my kooks and the performance gain is second to none. I running TB, cams, cai and 93 octane tune and I must say I’m in love. I know the kooks are a bit pricey but it’s worth, so worth. My car runs smooth and sound great. Deep nice tone and no raspy sound in the cabin. This is a must get. Thanks AM.

        Helpful (4)
      • December 22, 2018

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


        My car truly pulls now. Amazing sound. Performance gains through the roof. I have a tuner/CAI along with the long tubes and it’s just amazing how well it’s all coming together.

        Helpful (4)
      • December 04, 2018

        5 2008 GT - LG Installation Time: Full Day

        Great System

        this is a great upgrade for the 2008 mustang gt. fits perfect...with a little elbow grease no problems!

        Helpful (3)

      Questions & Answers (31 answers)

      5 Top Rated Questions

      With the cats in place, is this setup 50 state legal or only 49 state legal?

      • The catalytic converters included in this kit are not legal for use in California.

      Helpful (4)

      The 2005 GT has three sensors. Where do you suggest connecting them to and will I need another extension?

      • The 2005 Mustang GT will have 2 front O2 sensors, and 2 rear O2 sensors. these will install into the provided O2 sensor bungs, and will use the included O2 sensor extensions for the front O2 sensors. The rear sensors will not require any extensions.

      Helpful (3)

      ehaust will the kooks header and catted x-pipe combo manual set up hook to my flowmaster ehaust. Also do i have to use that serten type of tunner or can i use any tunner.

      • Yes this exhaust will hook up with your existing mufflers, stock or otherwise. Any tuner will work.

      Helpful (3) Show 2 more answers

      How long do they typically last on a daily before corrosion and all that starts happening?

      • Being as these are manufactured from 304 stainless steel, you should not see any rusting through. However, ultimately any surface rust or discoloration entirely depends on your driving conditions. The saltier and wetter the air is, the quicker it will happen.

      Helpful (2)

      Does it come with new strap clamps and O2 extentions?

      • This kit will include everything needed for the installation.

      Helpful (2)
      10 More Questions
      Will this match with the Roush catback exhaust setup? 1 answer
      Hello, I'm wondering if this catted system will pass the emissions test. I live in Ontario, Canada ,everything else in my 2006 GT is stock. Could you please let me know? I'm trying to find out before placing the order. Thanks, Ed 1 answer
      Will this combo fit with my flow master outlaw axle back exhaust? Is there anything extra I will need? 1 answer
      What makes these headers only work for manual transmissions? Why don't they work for automatics? 1 answer
      Can you get an h pipe instead of the x pipe. I want a deeper sound not raspy 0 answer
      Do these come with new gaskets and bolts for mounting? 1 answer
      I have both front 02 sensors melted on the wiring connections. Where do I order replacements? Part number on wire 1501907099 0 answer
      Will this fit with the borla stinger catback. 0 answer
      Will this exhaust install well with a whipple SC 0 answer
      Can the headers be ceramic coated 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • Headers
      • Mid Pipe
      • Gaskets
      • 02 Extensions

      Tech Specs

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

      Mid Pipe Specifications
      Style Mid Pipe: Shorty "X" Type Headers Required: Kooks Long Tube
      Piping Material: 304 Stainless Steel Piping Size: 2.5"
      Catalytic Converter: "Yes" Fitment: 2005-2010 GT - Manual

      Will It Fit My Mustang

      • Bullitt - 08, 09
      • GT - 05, 06, 07, 08, 09, 10

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