Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
$4,500 Giveaway! 3 Winners Enter Now

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

Item 65500
Market Price $1,687.71 You Save 18% ($297.08)
Our Price


FREE Shipping

Will this fit your Vehicle?

Select a different vehicle Help?
Update or Change Vehicle
In Stock

Ship to: Ashburn - 20149
Sorry, please enter a valid US or CA postal code
We're sorry, zip can't be updated at this time.
    Create a list
    Add to New List

    Saved - View your saved items

    We're sorry. We couldn't save this product at this time.

      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 (32)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 32 customers

      Installation Time: Weekend

      Installation Cost: $250-$500

      • 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 (2)
      • 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)
      • October 22, 2018

        4 2005 GT - MikeR Installation Time: Weekend

        Great Product

        Only got them installed this weekend after purchasing almost a year ago. The install took approximately 10 hours using jack and stands but this was my first time doing a fairly significant install. Be aware the driver side header especially does not offer much room to install and tighten the bolts 2 bolts took over a half hour to tighten. You will require various different wrenches and ratchets with different length handles and extensions (good quality tools recommended). There is not a significant volume increase but the exhaust not is much deeper when paired with my Magnflow cat back. I also paired these with a Bama performance tune so I do notice a slight difference in power. I have not had the car on a dyno so can not give actual numbers. Would definitely recommend especially for those who want to try nd keep a street legal car with cats.

        Helpful (4)
      • September 05, 2018

        5 2005 GT - Michael Installation Time: Weekend

        Hooks long Tube Headers

        Easy install! Sounds good! Very good product to buy!

        Helpful (4)

      Questions & Answers (27 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)

      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 (1)

      Does it come with new strap clamps and O2 extentions?

      • This kit will include everything needed for the installation.

      Helpful (1)

      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 (1)
      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
      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
      Is the catted x-pipe shorted to account for the long tube headers? I'm wanting to make sure they are to make sure they bolt straight onto my current aftermarket catback exhaust. 1 answer
      I am interested in trying to swap my 2006 V6 engine with the 5.0 power modular engine. Will this kit work for replacing my stock headers and exhaust? 0 answer
      Will item# 65500 Kooks long tube headers catted x-pipe combo, bolt directly up to my Borla ATAK cat back system I have on my 2008 Shelby GT? 1 answer
      since this set up has a cat? does that make it street legal ?? i live in Texas for reference 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

          Related Mustang Categories