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Kooks Long Tube Headers 1-3/4 in. (11-14 GT)

9 Reviews
Our Price

$989.99

  • Item #65503
  • MPN# 11412200

  • Market Price $1,099.99
  • You Save 10% ($110.00)
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Customer Photos
Features
  • Increases RWHP and Torque
  • Long Tube header design
  • Free flowing 1-3/4" mandrel-bent tubing
  • 304 stainless steel construction
  • Tig welded for strength
  • Fits 2011-2014 GT Mustangs
Description
More Horsepower and Torque. A set of Kooks Long Tube Headers will greatly improve the performance of your 5.0L Coyote Mustang. Kooks Headers feature an integrated venturi style collector that increases exhaust scavenging, and reduces turbulence to improve your 5.0's exhaust flow over the restrictive stock factory manifolds, boosting your Pony's horsepower and torque numbers.

Quality Construction. Kooks Long Tube Exhaust headers are manufactured from 1-3/4" mandrel bent 304 stainless steel tubing for superior airflow. These headers are TIG welded and feature a leak-free ball flange design for optimal performance and a better than OEM fit. Stainless steel hardware and gaskets are included.

Recommended Upgrade. To realize the full power potential that these Long Tube Headers have to offer, AmericanMuscle recommends a Bama custom tune with a Mustang Handheld Tuner to reprogram the vehicles computer (ECU) for proper operation.

Application. These Kooks Long Tube Headers are designed to fit the 2011-2014 5.0L GT Mustangs. Kooks long tube headers require the use of a Kooks shorty midpipe in order to be installed properly (see drop down option above).

Technical notes. Not legal for use on pollution controlled motor vehicles; intended for off road use only.

Mustang Fitment: 2011 2012 2013 2014 Details

What's in the Box
  • (1) Driver side header
  • (1) Passenger side header
  • (2) Gaskets
  • (16) Flange bolts
  • (4) Bolts
  • (4) Nuts
  • (8) Flat washers
Installation Info
Tech Specs
Header Specifications
Header Type: Long Tube Finish : Natural
Type Mid Pipe Required: Shorty Fitment: 2011-2014 5.0 GT Mustangs
Fitment
  • Boss 302 - 12, 13
  • GT - 11, 12, 13, 14

Most Helpful Reviews View All

Overall Rating 4.9/5 Write a Review
5/5
Worth the squeeze!

The performance gain and exhaust note on these headers is nothing short of outstanding. They took me and an ASE Certified tech 24 hours to install them on a lift. If you plan on installing them yourself,

Read More
Helpful (3) (0)

5/5
I love 'em.

I did a lot of research before pulling the trigger on these. I bought the catted H-pipe to go along with it because I prefer the sound of an H to the X. The quality of these headers is top notch. The price

Read More
Helpful (2) (0)

Customer Photos (2) View All

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Q & A (4 Questions, 4 Answers) Ask a Question

Guys, I really need a help over here, How much Horse power and torque would this headers add to my 2013 mustang gt?30-40 maybe? approximately

Troy316 Year: 2013 Model: GT

Good Question (1) (0)
  • I picked up 25'ish RWHP with my Kooks 1 7/8" long tubes and high flow cats when paired with a tune. I would expect the same with 1 3/4" if you're still N/A. Oh and a TON of sound!

    Helpful (0) (0)

    nsastang87xx Year: 2011 Model: GT

    Top 250 Contributor

Answer This Question

Kooks Long Tube Headers 1-3/4in (11-13 GT) I was wondering if Kooks Long Tube Headers 1-3/4in (11-13 GT) will fit the automatic or just manual

tt4vn9yu Year: 2012 Model: GT

Good Question (0) (0)
  • They fit automatics just as well as manuals. Have fun with your build!!

    Helpful (0) (0)

    seeul8tr Year: 2012 Model: GT

    Top 1000 Contributor

Show 1 more answer Answer This Question

Loudness Which headers are louder the 1 7/8in. or the 1 3/4in. I would assume the 1 7/8 are louder but just curious.

JohnnyWalker Year: 2011 Model: GT

Good Question (0) (0)
  • Headers don't increase the noise level. They can improve performance and change the sound pitch. If noise is what your after that would be in what muffles and diameter exhaust pipe you use. Try changing the cat. back system and maybe the intermediate pipe to an X pipe.

    Helpful (0) (0)

    Gunslinger Year: 1998 Model: Other

    Top 250 Contributor

Answer This Question

Reviews (9) Write a Review

  • 5 Stars .89 89%
  • 4 Stars .11 11%
  • 3 Stars 0 0%
  • 2 Stars 0 0%
  • 1 Stars 0 0%
4.9

out of 5 stars

8 Customers Recommend this Product

Installation Time:Weekend

Installation Cost:$250-$500

  • Performance Gain: 4.888889 4.9/5
  • Fit: 4.666667 4.7/5
  • Bang For Your Buck: 4.333333 4.3/5
Filter By Sort By
  • 5/5 Yes, I recommend this product

    February 05, 2013

    Worth the squeeze!

    The performance gain and exhaust note on these headers is nothing short of outstanding. They took me and an ASE Certified tech 24 hours to install them on a lift. If you plan on installing them yourself, save tons of time and just drop the K-member instead of working around it, you will be glad you did. Kooks makes a great product, but they will not stand behind it if it breaks. Not my best experience with customer service.

    Banshie50

    Year: 2012 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 Starkville, MS 39759, USA

    Helpful (3) (0)

  • 5/5 Yes, I recommend this product

    March 26, 2014

    I love 'em.

    I did a lot of research before pulling the trigger on these. I bought the catted H-pipe to go along with it because I prefer the sound of an H to the X. The quality of these headers is top notch. The price is a bit steep, but I used some discounts on this and in the end, they weren't much more expensive than most of the others. As far as the installation went... it was fun. It tooke me 12 hours to do it and I was taking my time. I reccomend taking a break halfway thru and do the install over 2 days. You don't have to drop the K-member. I raised the engine about 1.5" with a floor jack and had no problem getting the headers in. Plenty of ground clearance. Fitment is great, the only thing that got in the way is the cap that goes over the the starter wire. Part of the cap touched the header so I had to cut some of it off. Other than that... awesome. I had mine ceramic coated titanium. *almost* matches the valve cover, but it's close enough to look good (what you can see...) These headers, Kooks catted h-pipe and GT500 axle backs makes a great sound. No drone on the highway, and a nice throaty sound that is not over the top. I would install these again, and wouldn't hesitate to reccomend them to a friend.

    HitmansGT

    Year: 2014 Model: GT Driving Style: Street / Strip 'Stangs I have owned: 2 Springfield, mo

    Helpful (2) (0)

  • 5/5 Yes, I recommend this product

    September 09, 2014

    Boss 302 + Kooks LT + Kooks Catted H-Pipe = BEAST!!!

    Definitely a good investment and a great upgrade for your 2012-2013 Boss 302. I had the local dealership installed it and took them a while. Sound was amazing with the kooks catted H-Pipe so I was able to retain my side pipes. Sound was so amazing....did I say that already? WTH....I can say it over and over again. I still have my Track Key installed and the sound was indescribable with the lopey idle. Great power gains. Price is a bit steep but I guarantee you'll love it.

    Orangejazz

    Year: 2013 Model: Boss Driving Style: Street / Strip 'Stangs I have owned: 5 Guam

    Helpful (1) (0)

  • 5/5 Yes, I recommend this product

    November 22, 2013

    Kooks headers are awesome !!

    There awesome header and they make the car sound great it made mine so much louder the only thing that I would say was a pain was the install, the install took awhile and ran into a couple problems ( did it on the ground with a jack and stands ) but overall it turned out great I highly recommend this product

    Justinsenese

    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 New York, NY, USA

    Helpful (1) (0)

  • 4/5 Yes, I recommend this product

    January 24, 2013

    Great Product

    Kooks actually included the wrong bolts and wanted me to send pictures of their mistake. After doing so, they quickly mailed out the correct bolts. I have the high flow catted x-pipe also and I probably should have gone with the off road. (Engine light still appears regardless cant pass emissions) Very noticeable gains in torque and horse power.

    Black11Roush

    Year: 2011 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 3 Houston, TX

    Helpful (2) (1)

  • 5/5 Yes, I recommend this product

    December 26, 2012

    Kooks LT

    Overall great product. Great quality. It's definitely a weekend job. But well worth it. I notice the power gains along with a tune. I don't have any complaints other then american muscle sent me the wrong threaded header bolts. No big deal I picked some up from a local shop.

    Matt485

    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 5+

    Helpful (1) (0)

  • 5/5 Yes, I recommend this product

    May 22, 2012

    Amazing!!!!

    As the title says, these headers are AMAZING. I've gotten TONS of compliments and people asking what kind of exhaust I've got. They say it's the best they've heard racing down the track. With these headers and the Kooks off road x-pipe you can't go wrong. Installation was a task as I decided to install them in my garage on jack stands. The instructions are clear, however they say install them from the rear but we had to install the drivers side through the top and remove the altenator. Took roughly 38 hours to install, but I've never taken on a task this big. For someone that works on cars on a daily or weekly basis it probably won't take them near as long. If you're questioning yourself on whether to buy these or not... DO IT you won't be dissapointed!

    CrzyHrs

    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Huntsville, AL

    Helpful (3) (2)

  • 5/5 Yes, I recommend this product

    June 26, 2014

    gang941

    Headers+Kooks catted X-pipe, and Bama tune... Well worth the $$$$ spent...

    gang941

    Year: 2014 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 5 Bradenton, FL, USA

    Helpful (0) (1)

  • 5/5

    May 28, 2014

    Great product. 100% Happy

    Took a little longer than I thought to install the headers but in the end it was all worth it. The performance gain and sound are just awesome! Couldn't be happier.

    2013KenneBell50

    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 5 Monterey, CA, USA

    Helpful (0) (1)

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