Free Shipping On Orders Over $49. Details

Talk to a Mustang Enthusiast
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Win $15,000!! Enter Now
Coronavirus: We are Open For Business, Prioritizing health and safety Learn More

Kooks High Flow Catted X-Pipe (11-14 GT w/ Long Tube Headers)

Item 65504
Call a Mustang Enthusiast at 1-877-887-1105
M-F 8:30A-11P, Sat-Sun 8:30A-9P
Market Price $745.99 You Save 12% ($86.67)
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

      Justin: If you've already picked up a set of Kooks long tube headers or plan on purchasing a seat in the near future, you are going to need to pair it up with a corresponding mid-pipe like the catted X-pipe that we have here. Now, the Kooks mid-pipe again will be for the owners who prefer that X-pipe configuration over in each pipe per se and would like to include cat for tough emission states. Materials for this particular product will be mandrel bent 304 great stainless throughout. And installation will require the use of a corresponding set of Kooks long-tube headers. Price point for the made in the U.S.A. mid-pipe will be right around 600 bucks and the install of the mid-pipe itself won't be all that bad. It's the long-tubes that will be the knuckle busting portion of the install. So, by itself, the mid-pipe we'll call it a strong one out of three wrenches on the difficulty meter with a detailed walkthrough to come later in the video. So, again, the big takeaway here, guys, that you need to be aware of is that you have to pair up this particular mid-pipe with a corresponding set of Kooks long-tube headers because trying to pair this up to your stock manifolds or even a different set of aftermarket headers will simply not work. Now, one reason in particular Kooks doesn't include a mid-pipe with their headers right out of the box is because they like to give 11 to 14 GT owners a lot of options when it comes to piecing together their system. And honestly, they're one of the best at it on the site. In fact, they have six different mid-pipe options currently for the S197 owners out there considering a Kooks long-tube header. And this includes three different X-pipes and three different H-pipes each with a catless or off-road version, a high flow cat like we have right here and then finally, their green cat as they call it, which will be an EPA-approved catalytic converter and your best bet in eliminating emissions-related issues. And again, I love the fact that Kooks gives you guys these kinds of options because honestly, again, they're the only ones doing it on the site. Now, that biggest option applies to the difference between the X and H-pipe. A lot of aftermarket header companies simply give you an X-pipe and that's pretty much it. And yes, the mid-pipe we are talking about here today does feature the X-pipe as you can see it right here and therefore, you can expect a little bit more rasp and a little bit more volume at the end of the day. But if you're the type of owner who craves that deeper tone overall, feel free to check out the different Kooks H-pipe options here on the site as well. But aside from the crossover styles, the rest of your Kooks mid-pipe options will be pretty consistent from a material standpoint. That does include the premium 304-grade stainless steel throughout, three-inch mandrel bent tubing but does step down to two and three quarter inch tubing here allowing this to work with your factory cat-back or a different aftermarket cat-back that features that factory style connection. It's also worth pointing out that these different mid-pipes from Kooks are also designed to work with a one in seven-inch and chatter from Kooks in addition to the slightly smaller one and three-quarter inch primary Kooks headers as well. Let's shift gears and talk about the installation, and since we are focusing in on the mid-pipe for this particular video, we'll call it a strong one out of three wrenches on the difficulty meter. To give you a better idea of what's involved for the mid-pipe job, here is the detailed walkthrough along with the tool breakdown. Man: All right. We're gonna remove our H-pipe now. Got a 15-millimeter socket, we need to loosen up these two clamps right here. Next, we're gonna reach up in between the transmission and the tunnel and unclip our O2 sensors. We're gonna push in our tab. Push really hard and pull. And we're gonna do the same thing on the other side. Next thing you wanna do is remove the four knots that hold the catalytic converters to the stock manifold. Now, we had a lot of trouble removing these bolts. We ended up just breaking all four bolts. You can get through them from the top of the engine compartment with a very long extension or an S-wrench that we used. Turns out it was easier to break the bolts instead of fighting them. So, that's what we did. And now we're ready to remove our stock H-pipe. We can start the assembly of our X-pipe now. We're gonna install the last piece of the X-pipe now. Now that we've got our X-pipe mocked up in place, we can go through and start to tighten all our clamps now. All right. One of the last things we're gonna do under here is put our O2 sensors back in. I chose to do it somewhat last. You guys can put these in before you install your X-pipe. It's all up to you. All right. Now, we're gonna plug it in. All right. We've got a few things to wrap up here. This is the K-member support bar. That can go back on after this, we can put our K-member support brace back up and that's gonna wrap things up. Loosening that up, we're using a 15-millimeter socket here to tighten these down. All right, guys. That's gonna wrap up our review and install. Be sure to check out more at

      Product Information

      Features, Description, Reviews, Q&A, Specs & Installation


      • Required for Kooks Long Tube Headers
      • Improves Exhaust Flow and Sound
      • Raspy Race Car Growl
      • High Flow Catalytic Converters Included
      • 3" to 2.75" Tubing
      • Mandrel-Bent 304 Stainless Steel Tubing
      • Fits 2011-2014 GT Mustangs


      Increase Performance. Add even more horsepower and torque to the rear wheels of your 5.0 Coyote Mustang with a Kooks Catted Shorty X-pipe. The Kooks Catted X-pipe features high flow race catalytic converters to increase overall performance. This Kooks X-pipe is specifically designed to be used with Kooks Long Tube Headers.

      Race Car Growl.
      This free flowing Kooks X-pipe for the 2011-2014 GT Mustangs not only increases power, but it also adds a crisp raspy, race car growl to the sound of your exhaust with its modern "X" crossover pipe design.

      Quality Construction. Manufactured from 3" diameter mandrel bent 304 stainless steel tubing, Kooks X-pipes feature a merged "X" crossover for superior exhaust flow.

      This Kooks Shorty Catted X-Pipe is specifically designed to fit the 2011-2014 5.0L GT Mustangs with Kooks Long-Tube Headers installed. The step down to a 2.75" outlet allows for use of the OEM exhaust. 

      Fitment: 2011 2012 2013 2014

      MPN# 11413200

      CA Residents: WARNING: Cancer and Reproductive Harm -


      Customer Reviews (17)

      Write a Review

      Ratings Summary

      4.9 out of 5 overall rating from 17 customers

      Installation Time: Full Day

      Installation Cost: $250-$500

      • September 19, 2018

        5 2013 GT - SeanH Installation Time: Shop Install Installation Cost: $500-$1000

        Quality part!

        Unboxed the well packaged x pipes. Noticed right away the high end quality. Very pleased with the purchase.

        Helpful (3)
      • July 07, 2018

        5 2012 GT - Roland Installation Time: Shop Install Installation Cost: $500-$1000

        Superb Quality

        I bought the catted X-Pipe in conjunction with the Kook’s long tube headers, fitment is spot on! The high flow cats also help eliminate any of the nasty fumes that you might get with an off-road setup which is great as the car is daily driven. Excellent quality all around. The only thing worth noting especially if your car is lowered is that you will lose about an inch or so of ground clearance due to the circumference of the x-pipe which can scrape going up driveways etc if not careful. But with the headers the outstanding sound and power is definitely worth the trade off! And if I had to do it over I would buy this mid pipe again and again, pricey but well worth it! 10/10

        Helpful (8)
      • March 25, 2018

        4 2013 GT - ChrisF Installation Time: Afternoon

        Awesome stuff

        Bought car already had full kooks longtube headers and rest all the way to tips problem was need to pass emissions and was smelling bad exhaustin house after parking. Bought the cats xpipe went right into place and no issues quality pice and fit was bolt onto existing pipes

        Helpful (11)
      • June 18, 2017

        5 2012 GT - Michael Installation Time: Weekend

        Header and X-pipe upgrade

        Kooks long tube headers and catted X-pipe are beautifully made and fit well together. Really love the sound of of this set up. Sounds like a race car now and a nice power boost. Can't wait for the next upgrade.

        Helpful (8)
      • June 09, 2017

        5 2014 GT - MichaelM Installation Time: Shop Install Installation Cost: $500-$1000

        Can't beat Kooks

        Perfect fit, excellent flow. Really brings the car alive. Well worth the price!

        Helpful (7)
      • February 20, 2017

        5 2014 GT - AlexR Installation Time: Less than 1 Hour

        Coyote 5.0

        Best product out there worth the buck :) Sounds amazing with my MagnaFlow axel backs. You can feel the power.

        Helpful (9)
      • February 07, 2017

        5 2014 GT - 14DIB Installation Time: Afternoon

        Excellent Catted X Pipe

        Perfect X-Pipe that matches up to Kooks long tube headers without any issues. Easily installed once the long tubes are in place.

        Helpful (10)
      • October 13, 2016

        5 2013 GT - jimaki141 Installation Time: Full Day

        Kooks Catted X-pipe

        Perfect fit for my Kooks Long tube headers the excellent quality that goes into making these really shows. You get what you pay for. Perfect !!!!!!!

        Helpful (10)
      • September 15, 2016

        5 2007 GT - KS228 Installation Time: Less than 1 Hour

        Coyote swap in a 2007 GT

        This is the perfect fit for a coyote swap i put in a 2015 coyote engine in my 2007 GT with Kooks long tube headers and I had to do no modification for both.

        Helpful (13)
      • March 15, 2016

        5 2013 GT - froggie64 Installation Time: Full Day

        kppk,s catted x-pipe (11-14(gt with long tuybe headers

        these are great ,a guess they had to take the motor mount off to install them but everything went well ,got the car back and sounds great

        Helpful (11)

      Questions & Answers (18 answers)

      5 Top Rated Questions

      What kind of catback? So I have full long tube headers from kooks and z pipe from kooks. Should I buy a catback? I don't want any drone or want it too loud. Since the x pipe is a 3" does the stock catback fit? With Stock axle back, need advice please help thank you

      • Your stock catback will fit just fine into the x-pipe. The odds of having drone occur with your stock catback are slim to none since your stock catback is designed to keep noise at a bare minimum. As far as whether you should keep your stock catback, that's up to you. But to get the full effect of your investment into one of the best header/xpipe set ups on the market as far as performance, you should definitely do a catback, or at bare minimum an axleback. By doing this, you will be completing a smooth flow of air through your exhaust giving you the performance we all crave, but also give you the sound that you and your mustang deserve. I personally run the Corsa Extreme Axleback and cant say enough great things about it. I hope this helps.

      Helpful (3)

      Will this fit up to a borla cat back s types, I know I may have to take out the x pipe but would it fit still?

      • Yes, this will work with the Borla S Type exhaust.

      Helpful (1)

      Check Engine light If I installed this catted X-pipe with 1/ 7/8 LT KOOKS headers without PCM tuning will the check engine light fire up as the or it will not ?

      • Yes, you will get a CEL but it won't damage anything. The rear O2 sensors are going to get an under efficiency reading so they will need to be turned off or a tune will need to be written to trim out the engine parameters so you run at efficiency level.

      Helpful (1)

      Hello! Will It fit my BBK Long Headers. The problem is BBK XPipe is garbage. My BBK x-pipe rot in 4 years and rust ate the pipe and now is thin as paper. So I want to swap to a Stainless steel Pipe. Will it Fit?

      • We can only guarantee fitment of long tube headers with the same-brand mid pipe designed for that specific long tube header. Mixing between brands may require modification for proper fitment.

      Helpful (0)

      I have a 14gt with bbk cat deletes and x pipe. I just want to eliminate the fumes and have better exhaust flow and keep my car loud. will this xpipe do that for me or will it quiet my car down a little bit

      Post Your Question
      10 More Questions
      Will these cats hold with boost? I saw that Pypes have high flow cats for ProChargers wondering if the kooks would work? 1 answer
      Will this mid pipe fit 15-17 kooks 1-7/8. long tubes just the actual catted parts not the x-pipe connecter. 1 answer
      Does the cats hang above the frame rail ? or only the catless ? thanks 1 answer
      Will this pass emission inspection in NJ? 1 answer
      Okay I have stock cats on my car and flowmaster outlaw cat back on the car want high flow cats and a little less drone and will eventually do long tubes my outlaws are 3 in all the way will the outlaw axle backs work with these or no? And if installed will this throw a mil? Still need to pass inspection and if this won’t work recommendations on different set up for reasonable price 1 answer
      California legal? 1 answer
      What tuner will work best with the kooks 1 7/8 and catted x pipe? 1 answer
      What tuner will work best with these headers? 1 answer
      I have an off-road h pipe, will this one be a lot quieter or just a little bit? Tired of it being “too loud” since it’s a daily driver and I leave for work at 6am 1 answer
      Do I need to buy O2 Sensors for the Kooks 1 3/4 Longtube headers with the high flow cat mid/X pipe?? because ill have the car dyno tuned at Jms Chip Performance since I live in Mississippi. After installation. 1 answer

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) X-pipe
      • (2) catted down pipes
      • (2) Clamps

      Tech Specs

      Mid Pipe Specifications
      Style Mid Pipe: Shorty "X" Type Headers Required: Long Tube
      Piping Material: 304 Stainless Steel Piping Size: 3"
      Catalytic Converter: "Yes" Fitment: 2011-2014 5.0 GT Mustangs

          Related Mustang Categories