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Kooks Header & Off-Road X-Pipe Combo (05-10 GT w/ Manual Transmission)

Market Price $1,567.15 You Save 17% ($274.16)
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  • Item 65501
  • MPN#11313100

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Features & Details

  • Increase Rear Wheel Horsepower and Torque
  • Includes Headers w/ Matching Off-Road X-Pipe
  • 304 Stainless Steel Construction
  • For Off-Road, Track Use
  • Free Flowing Mandrel-Bent Tubing
  • Fits 2005-2010 Manual GT Mustangs
Improve Horsepower And Torque. The Kooks Long Tube Header and Off-road 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 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 Off-road X-pipe combo kit is designed specifically for the 2005 to 2010 4.6L GT and Bullitt Mustangs equipped with a manual transmission.

Technical Note: This Kooks product is intended for off road use, and is not legal for use in emission restrictive states.

Fitment: 2005 2006 2007 2008 2009 2010 Details

What's in the Box
Hardware included:
  • Kooks Long Tube Headers
  • Matching Kooks X-Pipe
  • Necessary Gaskets
  • O2 Extensions
Installation Info
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: "NO" - For off-road use only Fitment: 2005-2010 GT - Manual
Will it fit my Mustang?
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10

People Who Bought This Item Also Bought

Most Helpful Reviews

Love the exhaust combo!!

Although there are cheaper exhaust combos out there, you will never, ever go wrong with kooks. My dad and I installed the headers and mid pipe in our garage in under 8 hours taking our good old time. The ...

Read More
Helpful (7)


I went back and forth deciding on the bbk or catted kooks ones. I pulled the trigger and opted for these. I have the o/r roush extreme exhaust(no mufflers),roush cai and got the tune from BAMA. As soon ...

Read More
Helpful (4)

Overall Rating 5 out of 5 stars
Read All 12 Reviews

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Customer Reviews (12) Write a Review

Overall Rating 5.0

out of 5 stars

Installation Time:Full Day

  • Loudness / Volume 4.5 4.5
  • Exhaust Note 4.8 4.8
  • Fit & Finish 4.9 4.9
  • Bang For Your Buck 4.2 4.2

  • 5/5

    Installation Time: Full Day

    August 23, 2011

    Love the exhaust combo!!

    Although there are cheaper exhaust combos out there, you will never, ever go wrong with kooks. My dad and I installed the headers and mid pipe in our garage in under 8 hours taking our good old time. The quality and fitment of the headers is second to none. The car sounds awesome now (paired with a roush off road axle back exhaust). This combo really woke the car up. The ride pulls like a crazy/mad ape in the mid and upper range of the band. If you are on the fence about these long-tube headers (or long-tube headers in general) get them and i promise you will always have a smirk on your face after mashing the gas!


    Year: 2006 Submodel: GT

    Helpful (7)

  • 5/5

    Installation Time: Afternoon

    January 31, 2012


    I went back and forth deciding on the bbk or catted kooks ones. I pulled the trigger and opted for these. I have the o/r roush extreme exhaust(no mufflers),roush cai and got the tune from BAMA. As soon as I turned on the stang my face was in shock. These are loud!!! I love them. My friend has a Camaro SS and he couldn't stop raving about how nice it sounds. Overall they look nice, sound awesome and if you love driving with a smirk on your face....get me!!!!!


    Year: 2010 Submodel: GT El Paso,TX

    Helpful (4)

  • 5/5

    Installation Time: Full Day

    August 25, 2012

    Kooks Headers and Off-Road X-Pipe

    I love my new Headers and X pipe it sounds amazing paired with my Corsa Extremes. It pulls harder in the higher rpm rang than it did before. It took me about 6 hours to do the install. The fit and quality is incredible.


    Year: 2007 Submodel: Other Concord, NC

    Helpful (2)

  • 5/5

    March 01, 2011

    K00ks long tube headers and off road cross pipe

    This combination sounds great!!! You can feel the extra power in the upper rpm range. Just make sure you have some knowledge and the right tools before you tackle this project and u should be ok.

    perry guillory

    Year: 2008 Submodel: GT

    Helpful (2)

  • 5/5

    Installation Time: Weekend

    August 30, 2017


    I took my time installing these over a period of 4 days in my garage on jack stands, In some of the reviews and install instructions they tell you to jack up the engine, remove engine mounts, move the ac compresser ect , I didn't do any of those things, granted it may have increased my install time but the end result was the same. As far as sound goes, I coupled my header system with the Borla complete touring system, and I think it sounds great, not enough to wake up the folks next door at 5am when you leave for work unless you want to, then just punch it.


    Year: 2006 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    January 27, 2017

    Can't believe I waited so long!

    I have been wanting these long tubes for well over a year and since I already had the motor pulled to do a full rebuild, I decided to pull the trigger. I am so glad I did. The car sounds amazing. For starters, I already had a fairly unique exhaust setup. I was running an O/R x pipe to Pypes m80s with FR500S axlebacks. Now, I'm running these with the same m80s and axlebacks and to me, its absolutely perfect. Believe it or not, these mellowed out the exhaust. Great sound on start up, but not wake the dead loud like my set up was before. Fairly tame, yet noticeable while cruising, then opens up when you get on it. The car feels a million times stronger, but this was combined with a build and other goodies, so I cant speak on the power add by these alone. But I absolutely recommend these to anyone that wants headers. You pay for what you get... spend the extra money.


    Year: 2008 Submodel: GT

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    August 27, 2015

    Kooks - The Obvious Choice For Serious Mustang Intosiasts

    After a lot of comparing, I decided to order the Kooks LT's and O/R X-pipe from AM. Right out from the box everything looked great except that there was a lot of metal filings that I had to degrease and wash thoroughly, I also did not like the aluminum header gaskets that were supplied with the kit so I got a set of Fel Pro's instead, that was my only disappointments. The install went well especially being done with jack stands on the floor. I tried to cut corners by not removing the engine mounts or steering shaft or A/C comp. But I ended up having to remove everything just to gain access to tighten the header bolts. I found that the biggest pain was getting the passenger side engine mount off and on being behind the A/C comp. The Kooks LT's looks great and sounds really loud once paired with Ford Hot Rod Cams and a tune, it was worth all the cuts and bruises. One bit of advise when removing the stock H-pipe, support the rest of the exhaust because I bent my muffler hanger brackets and had to remove the mufflers and straighten the brackets. I would definitely recommend this product wether you choose to do the install or have a shop install it. Thanks AM for another great product.


    Year: 2007 Submodel: GT Brampton, ON

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    June 06, 2014

    Sounds and feel great

    Installation was not too bad, just getting to tighten the bolts on the headers was a bit of a pain even with the motor slightly lifted. The sound this system produces is just nice, when driving around it isn't too loud but once you want to get up and go it wont disappoint. I was told by my buddy who helped me install it is to check the bolts that hold the connections a few times for the first week because they need to go through a few heat cycles and tend to get a bit loose.


    Year: 2005 Submodel: GT Hobbs, NM, USA

    Helpful (1)

  • 5/5

    Installation Time: Full Day

    December 22, 2012

    Tons of power and noise

    I now have a late 60's era mustang due to this product. It really made the car breath better and unleash some horses. It fits great and the deep throaty sound is fantastic. This setup gave me about 50hp with a cai and intake manifold from ford racing. I would recommend this to any ford enthusiast.


    Year: 2010 Submodel: GT Orlando

    Helpful (1)

  • 5/5

    Installation Time: Shop Install

    March 24, 2012

    Kooks LT Header & O/R X Pipe

    This combination definitely wakes up the car; along w/an existing Borla cat-back, the sound is incredible. The before/after compared to the stock manifold makes me wish I had made the upgrade a long time ago. Increase in torque is most noticable at 3000 rpm and above...pulls hard when you stomp the gas. Don't have the tools to self-perform, so it was an easy decision to go w/local shop. Shop recommended Kooks or ARH; comparable price between the two so I chose Kooks b/c of the header comparison 5.0 Mustang did a while back. All materials arrived neatly and securely packaged; shop had no problem w/the install and fit & finish are perfect. Definite head turner. One caution will no longer have any desire to listen to your radio after this install. Well worth the investment!


    Year: 2006 Submodel: GT Texas

    Helpful (1)

  • 5/5

    Installation Time: Afternoon

    June 15, 2017


    Installed the Kooks headers on my son's 2008 Mustang GT/CS and the headers and x pipe are very top quality products. They come with all hardware. They look great and sound even better. Only wish the X-Play would have come with hangers to go back in stock location. But was able to make my on and Tig weld them to the pipe.


    Year: 2008 Submodel: GT

    Helpful (0)

  • 5/5

    August 11, 2016

    Kooks Long Tube Headers Sound Sweet

    Headers fit well, and gaskets were top notch, no re-tightening was necessary. Sound and performance are worth the extra money!


    Year: 2006 Submodel: GT

    Helpful (0)

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