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

Market Price $1,687.71 You Save 18% ($297.08)
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$1,390.63

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  • Item 65500

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    Features, Video & Details

    • 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

    Review & Installation Video

    Review & Install Video

    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

    more

    CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

    What's in the Box
    Hardware included:
    • Headers
    • Mid Pipe
    • Gaskets
    • 02 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: "Yes" Fitment: 2005-2010 GT - Manual
    Will it fit my Mustang?

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    Questions & Answers (22)

    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

    Will this match with the Roush catback exhaust setup?

    • We cannot guarantee that the Kooks Long Tube Headers w/ Catted X-Pipe will work with any of the Roush Cat-Backs because they are designed to bolt to the factory location.

    Helpful (1)

    Will this combo fit with my flow master outlaw axle back exhaust? Is there anything extra I will need?

    • The Kooks Header and Catted X-pipe Combo can be used with any axleback with no issue. There are no additional components required, however a tune is highly recommended.

    Helpful (1)

    Does it come with new strap clamps and O2 extentions?

    • This kit will include everything needed for the installation.

    Helpful (0)
    Post Your Question
    10 More Questions
    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? 0 answer
    The 2005 GT has three sensors. Where do you suggest connecting them to and will I need another extension? 1 answer
    since this set up has a cat? does that make it street legal ?? i live in Texas for reference 1 answer
    Will this fit with the slp loud mouth axel back? 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
    Hey all, just to be sure but this system will work with a magna flow cat back exhaust. If it does work does anyone know if I will have any issues with the emissions requirements in Ontario Canada? Thanks 1 answer
    Will this fit on a 2006 3valve Saleen s281 stock exhaust and if the recommended tune is paired with the product whats the hp gains we're looking at. Thanks for the help. 1 answer
    What kind of tune would you recommend or I could tell the garage I need when they install it? 1 answer
    Will this combo kit make use of all 4 O2 sensors? Up and downstream? 1 answer

    Recommended For You

    Customer Reviews (29) Write a Review

    Overall Rating 4.9

    out of 5 stars

    Installation Time:Weekend

    Installation Cost:$250-$500

    • Loudness / Volume 4.607143 4.6
    • Exhaust Note 4.857143 4.9
    • Fit & Finish 4.714286 4.7
    • Bang For Your Buck 4.714286 4.7



    • 5/5

      Installation Time: Weekend

      March 13, 2019

      new sound

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

      RobertC

      Year: 2008 Submodel: GT

      Helpful (0)

    • 5/5

      Installation Time: Weekend

      February 11, 2019

      POWER

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

      Brendan96

      Year: 2005 Submodel: GT

      Helpful (2)

    • 5/5

      Installation Time: Afternoon

      January 07, 2019

      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.

      Somar

      Year: 2008 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      December 22, 2018

      BEAST

      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.

      GrantL

      Year: 2007 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Full Day

      December 04, 2018

      Great System

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

      LG

      Year: 2008 Submodel: GT

      Helpful (3)

    • 4/5

      Installation Time: Weekend

      October 22, 2018

      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.

      MikeR

      Year: 2005 Submodel: GT

      Helpful (3)

    • 5/5

      Installation Time: Weekend

      September 05, 2018

      Hooks long Tube Headers

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

      Michael

      Year: 2005 Submodel: GT

      Helpful (4)

    • 5/5

      Installation Time: Full Day

      May 21, 2018

      Looks exhaust

      Sounds great and received exceptional power gains.

      JohnH

      Year: 2006 Submodel: GT

      Helpful (7)

    • 4/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      April 18, 2018

      Now sounds like a beast

      I read enough to not try the install myself since I don't have a lift. So I had a shop install them. I was really surprised at how much louder my car was vs. stock. I have put headers on a few cars I've owned and these made the biggest difference in sound by far. I really wasn't going for the loud, but it's not too bad as long as you aren't into the throttle too much. I had put on a supercharger a year or so ago and wanted the headers so things could breath better. I did run into an issue that isn't completely resolved yet. The clearance on the driver side cat is very minimal. When I first picked up the car after the install, the cat was hitting on the driver side both on the floorboard and the O2 sensor was hitting the transmission mount. After some wrestling and minor grinding by the shop, the driver side cat clears the floorboard (barely) and the O2 sensor no longer hits. But after the exhaust heats up after 20 minutes or more of driving, the driver side cat hits the floorboard occasionally when accelerating causing a bunch of noise. I may need to take it to an exhaust shop to tweak a bend to give me some clearance? Overall, I'm very happy with them. Although I need to get the clearance issue resolved.

      jslacy

      Year: 2008 Submodel: GT

      Helpful (11)

    • 4/5

      Installation Time: Weekend

      April 09, 2018

      Long tubes

      Great ad on for my Roush mustang, installation was completed with 4 tall jack stands I did not have to remove the motor mounts or k member. I did throw out the supplied mounting bolts for a good set of headlock locking header bolts. Also a good selection of hand tools will make install a lot easier..

      BentRod

      Year: 2008 Submodel: GT

      Helpful (8)

    • 5/5

      Installation Time: Weekend

      September 10, 2017

      Sounds like a beast

      I got this combo with the Pypes muffler delete and it sounds loud and raspy just like i wanted.

      JoeR007

      Year: 2007 Submodel: GT

      Helpful (7)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $250-$500

      September 02, 2017

      MUST BUY!!!!

      I had these to go with my Flow Master Outlaw Axle backs and I must tell you it is amazing! I cant get over the feel and sound! It is expensive, but extremely worth it!

      Mickie

      Year: 2005 Submodel: GT

      Helpful (8)

    • 5/5

      Installation Time: Full Day

      June 21, 2017

      high class long tube headers

      fits perfect, but need some little 4- 5 final ajustement. sound was really perfect with my bullitt stock muffler.

      HugoB

      Year: 2008 Submodel: Bullitt

      Helpful (6)

    • 5/5

      Installation Time: Full Day

      June 14, 2017

      Great product

      After many hours of research on multiple headers and mid-pipes, I finally decided to go with Kooks. I was a little weary of buying the Kooks as they are the most expensive out of any others, however, the quality of the material, as well as the quality of the sound, simply cannot be beaten. Getting these headers to fit onto the engine was a bit of a pain. The lower header bolts become very hard to get to when the new headers are put on. If you find yourself purchasing this great product, I would HIGHLY recommend removing the K-member as it will allow you to get your hands directly underneath the headers instead of having to go from the side like I did. It took my father and I around 9 hours from start to finish while using a lift. Nontheless, these headers are amazing and give you an amazing sound that is sure to turn heads going down the road.

      DrakeP

      Year: 2009 Submodel: GT

      Helpful (6)

    • 5/5

      Installation Time: Full Day

      March 17, 2017

      Can't go wrong with kooks

      Purchased these for my 08 GT and the sound is phenomenal. Such a night and day difference between stock manifold. My mechanic said they were the best fitment and quality headers he has installed ever. The x-pipe does give a very raspy tone so if you don't like that type of tone I would say get the headers and go for the kooks h-pipe instead. Overall great product and I am very satisfied.

      mitchjb98

      Year: 2008 Submodel: GT

      Helpful (7)

    • 5/5

      Installation Time: Afternoon

      January 22, 2017

      Amazing Quality

      I like many others have done hours upon hours of research for the best headers for my pony. Everyone is gonna have their own opinion and mine now more than ever is Kooks. The quality of the welds and stainless steel tubing are superior to some other brands that I have seen. The moment I started my pony up you could just hear her singing with joy. The x-pipes have a bit of raspy tone to it and the overall noise isn't too loud making it just enough to wake your neighbors at 5am but not enough to put you on any police radars. These are a little on the pricey side but you get what you pay for.

      Ziggy

      Year: 2007 Submodel: GT

      Helpful (9)

    • 5/5

      May 20, 2016

      05 Saleen NOVI 2200

      Had local shop install these and netted additional 52 RWHP and 36 ft lb Torque. This was also with the addition of Steeda Charge motion delete plates. 502 RWHP and 457 torque. Clutch slipped at 6K RPM so need a upgrade. Made a HUGE difference and could not be happier. 373s were also added.

      Ammotroop

      Year: 2005 Submodel: Other

      Helpful (7)

    • 5/5

      Installation Time: Shop Install

      Installation Cost: $500-$1000

      July 11, 2015

      More power, great fit, great sound

      I bought this after intake, cam, gears (and other stuff). Fit is great, power increase is wonderful, and the sound is fantastic. Without changing the exhaust your power isn't maximized.

      Wally1681

      Year: 2006 Submodel: GT Minneapolis, MN

      Helpful (6)

    • 5/5

      Installation Time: Weekend

      August 14, 2014

      Bigfoot

      This header kit is absolutely the best item I have installed yet on my 2007 Shelby GT to date. The install took me a weekend to complete, but only because I don't have a lift. I bought the Flowmaster Outlaw mufflers a couple years and that sounded great without the headers. Now that I have installed the Kooks headers with X-Pipe kit, and combined with the Flowmaster Outlaw Mufflers the sound is OMG out of this world. Anyone looking to put a set of on their Mustang, I strongly suggest the Kooks header with X-Pipe kit. The sound that is put out, seems nothing short of a straight pipe exhaust system. This item gets a 10+ from me. Thanks American Muscle.

      Bigfoot4000

      Year: 2007 Submodel: GT Southern California

      Helpful (9)

    • 5/5

      Installation Time: Full Day

      November 13, 2013

      Awesome Power / Great Sound

      I love this package. I replaced my shorties with these Kook LTs and I couldnt be happier. Not only is the exhaust note very powerful but the power increase when combined with my CAI, FR TB, FR Intake Manifold, and Bama Tune put me at a dyno-ed 330 HP to the wheels. Good job Kooks.

      JaredMoon

      Year: 2007 Submodel: GT USA

      Helpful (8)

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