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

Item 65502
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      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 Automatic GT Mustangs


      Improve Horsepower And Torque. The Kooks Long Tube Header and Catted Shorty X-pipe combo kit for the automatic 2005 to 2010 GT Mustangs 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 1-5/8" 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 Mustangs equipped with an automatic transmission.

      Fitment: 2005 2006 2007 2008 2009 2010 Details

      MPN# 11312010



      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (14)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 14 customers

      Installation Time: Weekend

      Installation Cost: $500-$1000

      • September 11, 2018

        5 2005 GT - BenjaminS Installation Time: Shop Install Installation Cost: $250-$500

        grate exhaust note

        the kook long tubs r the best out there if you dont have them get them

        Helpful (5)
      • January 27, 2018

        5 2005 GT - mikebev Installation Time: Shop Install Installation Cost: $500-$1000

        what a difference

        Tell you rite know, its quite a job putting them on,i had shorties, its quite a switch,need to know what your doing then you should be ok. let me tell you what a sound theirs nothing like it, any better mite be to much for the street. i am super happy, with this whole set up. for the automatic on the dyno picked up 18.47 hp at rear wheels and14 lbs of torque.Very happy,very worth it. If i knew this would of never got shorties Mike Bev

        Helpful (10)
      • December 27, 2017

        5 2006 GT - Tresleches Installation Time: Weekend

        Great product!

        Great product and sound! Can’t go wrong with this!

        Helpful (8)
      • April 23, 2017

        5 2007 Other - John54 Installation Time: Full Day

        2007 Shelby gt

        The kooks headers and x pipe are a quality product. Installation was a pain but every thing fit well. My car has the original ford muflers but the headers made it louder but not irritating. With the headers and bama tune my car chirps the tires shifting into second gear and third. Thanks am.

        Helpful (9)
      • June 20, 2016

        5 2005 GT - Daniel Installation Time: Shop Install Installation Cost: $500-$1000

        Kooks headers with "X" mid. pipe

        product is well made.using the org. mufflers. Exhaust is quiet until you start pressing on the gas.

        Helpful (10)
      • May 22, 2015

        4 2007 GT - Redfire Installation Time: Shop Install Installation Cost: $250-$500

        Looks great - sounds better

        I had this installed alongside an Intake Manifold, FR Cams, FR Throttle Body, so I can't isolate the performance gains of this upgrade itself. As a whole though, these changes made a BIG difference. I have PypeBomb Axle Backs and together the exhaust rumbles. Of course with power upgrades come trade offs -- the drone is more pronounced that it was before. No problems with clearance -- and the install went without issue -- but I had a shop do the work.

        Helpful (10)
      • September 13, 2014

        5 2010 GT - MustangGT10 Installation Time: Shop Install Installation Cost: $500-$1000


        Ive been shopping around for Headers for a few months now. My local Mustang Performance shop recommended going with Kooks. At first I was a little hesitant because of the cost but I was told that the Kooks quality and the fitment can not be beat. After doing some research I decided to take their recommendation and make the purchase. Lets just say I couldn't be happier with my decision!! Right out the box I could tell that these are high quality headers!! The stainless steel is amazing and the welds looks perfect. I took the kit to the shop and had them do the install. I had the LT Headers, High Flow Cats and the X-Pipe all installed for $550. I also had Bama Performance send me a new tune for my iTSX tuner. Once I cranked it up I couldn't believe the way it sounded!!! I also have Ford Racing Hotrod Cams so when combining all of this the new exhaust note is simply AMAZING!!! I didn't think I could get my 2010 GT to sound like a 1960s muscle car!! The sound is a night and day difference. Once I got her on the road I could instantly feel the power, especially at WOT....Once I tap the throttle she is wanting to take off...Sitting at idle at stop lights I get nothing but looks!!...Between the power, HP increase and the sound I couldn't be happier with the purchase!! Airraid intake, FRPP 3.73 gears, iTSX custom tune, Kooks LT Headers and FRPP Hotrod Cams all purchased through AM...My 2010 GT is simply unbelievable!! I definetely recommend these headers and then some!! Thanks AM for always providing such amazing products and customer service!!

        Helpful (8)
      • March 24, 2013

        5 2008 GT - Babelfish Installation Time: Shop Install Installation Cost: $500-$1000

        Sounds great!

        I had these put on for 600 bucks at my local speed shop. These headers really sound great. I have SLP Loudmouths with them and it is really loud. I think the Loudmouths may need to be changed out to be honest. I do love the distinct sound from the headers. The engine seems rev a little easier now with the headers in place. When I really get on the gas, it just screams and sounds wicked. This mod is a really good supporting mod for my overall build project!

        Helpful (8)
      • March 22, 2013

        5 2005 GT - JCaseyT Installation Time: Shop Install Installation Cost: $250-$500

        Best Mod on my car yet!

        I spent a lot of time looking at what exhaust to get and making sure it made the sounds I was looking for. I got these for Christmas from my fiance because she was snooping on my build list and caught them on sale. After installing these with some Pypes Violators Axle-backs and FRPP Hotrod cams I can honestly say this car is the best sounding Mustang in town. I get a lot of positive comments on the classic rumble and out right roar at WOT. This setup has set off 3 car alarms and counting on start-up and idle. You WILL NOT be disappointed with the sound or the power gains I can surely promise you that!

        Helpful (11)
      • May 26, 2012

        4 2005 Other - Ticen57 Installation Time: Full Day


        Just intalled the long tube headers last night. Took a while but that was because i had to use jacks and didnt have the greatest of tools. The Catted system does not come with hangers for the x pipe so you will have to have some welded on. I have had to drive my car without the catts and x pipe for 2 days now and oh wow! I wont even start the car after 8 because it is so CRAZY loud! The sound is amazing, i just need to get the x pipe in and some mufflers. The headers fit great! But that was after propping the engine up a good 10 inches and taking off the motor mounts, starter, steering shaft and dip stick. Dont have any problems with fitment. Cant wait to have the rest of the exhuast put on so i can actually start the car without making everyone mad xD

        Helpful (11)

      Questions & Answers (22 answers)

      5 Top Rated Questions

      reading about the bbk mid pipe with cats it looks like you have the o2 turn off which seem like the cats would be on these kooks is it the same ordeal or do they work with the o2.also would the auto headers work with a manual(for example the manual might not work with an auto but auto might work with both)cuz i have an auto but may in the future go to manual

      • The Kooks Long Tube Headers with Catted X-Pipe should not require you to disable the O2 sensors. We have not tested the automatic headers with a manual transmission car, however we do believe their would be fitment issues due to differences in transmission dimensions.

      Helpful (1)

      Do i need to have my car tuned after installed these long header with catted x--pipe? do I get instant HP increase without a tune?

      • We highly recommend having a tune with your headers. If you do not use a tune, you will not see a very good performance with your setup.

      Helpful (0)

      2006 mustang got. Will this work with stock exhaust? Until I get the funds to purchase a cat back system?

      • Yes, this will work with the stock exhaust.  

      Helpful (0)

      Will this work with stock exhaust? Until I get the funds to purchase a cat back system?

      • Yes, this will work with the stock exhaust.

      Helpful (0)

      If I were to purchase this headers and catted x-pipe combo can I run a 3" cat back exhaust system or does it have to be 2.5"? Or do you guys offer a header combo where I can run a 3" cat back system??

      • You can run a 3" cat back exhaust system it includes or if you add a step up flange to allow the 2.5" X pipe to match with the 3" exhaust.

      Helpful (0)
      10 More Questions
      I currently have an automatic trans on my 2006 GT And was planning on swapping to a manual trans but don’t have that money now so if I get these headers will they fit a manual trans in the future? 0 answer
      Will these Kooks LT Headers and X-Pipe fit with no modifications to the 2.5 inch tubing Roush Extreme Cat-Back exhaust? 1 answer
      i live in Mo.will these cats pass smog emissions 1 answer
      Are the Kook long tube headers w/ Catted X-pipe emission legal in California? 1 answer
      So I have the SLP Loudmouths axle this set up compatable with what I have already? 1 answer
      Will this work with the roush extreme performance catback exhaust? 1 answer
      I really don’t want to have to deal with tunes and bad codes can these headers still be installed without a tune? 1 answer
      Are the Kook long tube headers w/ Catted X-pipe emission legal in Arizona? 1 answer
      Are these Long Tube Headers gonna stay that shiny color or will they distort into something else? i’m looking for something that won’t distort colors from the heat. thanks for the help! 1 answer
      So, I currently have Flowmaster Outlaws on my 05. I'm looking for a set of long tubes for performance reasons. But I'm wondering if anyone has tried this combination, and how loud is it? My build is a Street Warrior kind of deal, so I want power and loudness but not deafeningly so. 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      Hardware included:
      • Kooks Long Tube Headers
      • Matching Kooks X-Pipe
      • Necessary Gaskets
      • O2 Extensions

      Tech Specs

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

      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 - Automatic

      Will It Fit My Mustang

      • GT - 05, 06, 07, 08, 09, 10

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