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Pypes X-Pipe (11-14 GT)

52 Reviews
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  • Item #20119
  • MPN# XFM45

  • Market Price $170.99
  • You Save 9% ($16.00)
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  • Improves Exhaust Flow and Sound
  • Raspy Race Car Growl
  • 409 Stainless Steel Construction
  • 3" To 2.75" Mandrel-Bent Tubing
  • Reuses Stock Catalytic Converters
  • Reuses Stock Clamps 
  • Fits 2011 to 2014 GT Mustangs
Improves Exhaust Flow. Ford actually did a nice job on the stock Catalytic Converters, but the factory H-Pipe could actually use some improvement. That's where the Pypes X-Pipe comes into play. Designed to balance out the exhaust gas pressure in your system, this X-Pipe reuses the stock Cats saving you money.

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

Reuses Stock Cats. The Pypes X-Pipe bolts up directly behind the stock catalytic converters with no cutting required saving you time and money. By reusing your stock catalytic converters and stock clamps, you ensure that your Mustang is smog-legal.

Quality Construction. Pypes constructs their Mid Pipes from 3" diameter free-flowing mandrel bent 409 stainless steel tubing and has a reduction in the rear to hook up to your 2.75" factory cat-back. This Mid Pipe features a merged X crossover to increase exhaust flow for a significant improvement in power and sound.

Application. The Pypes X-Pipe is designed to fit the 2011 to 2014 GT Mustangs with either the stock exhaust manifolds or aftermarket shorty style headers installed.

Fitment: 2011 2012 2013 2014 Details

What's in the Box
  • (1) After-Cat X-Pipe
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: "X" Type Headers Required: Shorty or Stock Manifolds
Piping Material: 409 Stainless Steel Piping Size: 3" to  2.75"
Catalytic Converter: Reuses stock Catalytic Converters Fitment: 2011-2014 GT Mustangs
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • GT - 11, 12, 13, 14

Most Helpful Reviews

Pypes after cat x

Orderd the after cat x pipe fast delivery good quality product. The install took a little less than a hour I did have to cut a 1/2 of an inch off but other than that perfect fitment

Helpful (1)

X pipe vs H pipe

Changed my Heartthrob H pipe to this Pypes X pipe. The H pipe gives you a deeper American muscle car sound. The X pipe gives you Nascar sound. For me prefer the Nascar sound. But if you want a deeper ...

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Helpful (6)

Read All 52 Reviews
Overall Rating 4.7 out of 5 stars

Customer Photos (13) View All Photos

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9 Questions / 4 Answers

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Installation I was curious if this would be a direct bolt on with the bassani cat back. I heard you had to weld it. If you don't have to for the bassani 3" cat back I will buy. Thanks!


  • No bud, theoretically, you really don't need to weld any piping on an exhaust system but you should from manifolds/headers to down pipe joints to ensure sparks are sealed. As far as the mid section to the tailpipes, (assuming your sticking to factory pipe I.D.), crank down some good 1/2" pipe clamps over a "slip-on" connection between your mid and rear exhaust system and it should be just fine. However, if you need to transition up or down, let's say 3"-2.75" or 2.5"-3" whatever the case may be, I would recommend welding at least one end of transition closest to your engine and leave other end "open" for easier installation/removal in case you want to switch cat back systems or whatever. Of course, the more solid, the better. Leaks=power loss/possible damage to underside of vehicle. Clamps are great for straight true round pipe......not effective on bends or oblonged piping. The addition you go with past your rear can get away with half assing it without any potential danger whether it'd be clamping straight pipes, axle backs, or whatever your heart desires. Even if you try to weld mufflers or straight pipe to your "over axle" connection your still going to have a tiny bit up top where you can't reach your welder and that far back in the exhaust system will not affect anything with a tiny gap in your bead because by then, your pressure is pretty much "through the cycle" and the only thing left for that flow is the noise out of the muffler or pipe. The muffler design is made to create your back pressure needed for performance long before it actually reaches the muffler. It creates kind of an "end cap" pressure builder for the exhaust system and at the same time acts as a pressure relief. Sounds confusing but I'm not too good at explaining without hands on demonstration. I hope this helps and sorry if I went overboard on the subject lol, that's just me bud.....I like to go in depth. Good luck


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Compatibility with Ford Racing Axelback exhaust I'm looking to add the Ford Racing Sport Axle-Back Exhaust to my 2012 GT, and I am wondering if this X-Pipe is a good fit and compatible. Are there any pitfalls I'm overlooking? I don't mind paying a good muffler shop to do the work if it's above my skill level. Does this setup keep the resonators in place, and is that a good or bad thing?


  • hey man, i am looking to purchase this as well, and researched it accordingly to include chatting with an am chat advisor. it bolts on to the factory cats and then to your factory piping just before the resonators. so your resonators will stay with this x pipe installed. if you want the resonators removed a shop can easily cut them out and install piping in its place but be absolutely ready for a super loud and in some instances an annoying exaust without resonators. i suggest going with the x pipe and driving it for a bit to see how you like it before cutting resonators out. resonators can always be re installed. so have no fear. hope this helped.


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will this fit a borla catback exhaust will buy if it fits a borla catback with stock headeres


  • Yes I have borla s type axle backs with this xpipe sounds great


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Customer Reviews (52) Write a Review

Overall Rating 4.7

out of 5 stars

  • 5/5

    Installation Time: Less than 1 Hour

    January 29, 2016

    Pypes after cat x

    Orderd the after cat x pipe fast delivery good quality product. The install took a little less than a hour I did have to cut a 1/2 of an inch off but other than that perfect fitment


    Year: 2014 'Stangs I have owned: 5+ Heyburn id

    Helpful (1) (0)

  • 5/5

    August 20, 2011

    X pipe vs H pipe

    Changed my Heartthrob H pipe to this Pypes X pipe. The H pipe gives you a deeper American muscle car sound. The X pipe gives you Nascar sound. For me prefer the Nascar sound. But if you want a deeper American muscle car sound, go for H pipe. The Pypes X pipe is the best buy among X pipe. Installation is easy, took about 30 mins to install by a professional.


    Year: 2011 Model: GT Driving Style: Daily Driver

    Helpful (6) (0)

  • 4/5

    Installation Time: Afternoon

    December 08, 2011

    Pypes X-Pipe (11-12 GT)

    ...the installation took less than a hour, the fit and finish is top notch, however these are 3" and the factorys are 2.75", others have chosen to weld after the "X" junction, but this method could be a hassle if you later need to remove the tranny for clutch service if you have the manual. So I took a quarter pound mallet and beveled the 3" tubing to match the factory size and used a clamp, presto! Awecome sound with the cats, not too raspy, great price for stainless steel.


    Year: 2012 Model: GT Driving Style: Race 'Stangs I have owned: 5+ Puerto Rico

    Helpful (5) (1)

  • 5/5

    Installation Time: Afternoon

    April 05, 2012


    I had my mechanic install the X pipe with a 3" resonator delete to go with my GT500 axle backs. The sound is awesome! Good and quiet at cruise, big growl at WOT and a low rumble at idle, everything I wanted. This x pipe is a quality piece and I highly recommend it!


    Year: 2012 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Phoenix, AZ

    Helpful (3) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    December 26, 2012

    Great X pipe

    this is a great x pipe gives you a raspy sound. i got mine with roush axle back and absolutely love them. great product


    Year: 2013 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Amarillo, TX, USA

    Helpful (2) (0)

  • 5/5

    July 05, 2011

    X Pipe

    Good x pipe. Splices right into the mid pipe, one end re uses the stock clamps and the other end has to be welded in. Sounds great.


    Year: 2011 Model: GT Driving Style: Street / Strip

    Helpful (2) (0)

  • 5/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    July 21, 2012

    Great product for the price

    I bought this x hoping to improve the sound of the car and I go much more that I bargained for. I couldn't be happier. I have Roush axle backs installed and I feel this part really woke the exhaust note up. The exhaust has a nice deep rumble at an idle, quiet at a cruise on the express way, and screams like crazy under heavy acceleration. The Pipe does have to be installed by a shop because it does need to be welded on. The stock exhaust on the 2011 is 2 3/4 inch and the x pipe is 3. I suppose you could find an adapter and clamp in it place but I opted for the welding. It cost 130 at a local shop and they were done in about an hour. This really is a great piece for the price and is a great addition to your exhaust.


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

    Helpful (3) (1)

  • 4/5

    Installation Time: Afternoon

    November 24, 2015

    Great budget x pipe

    I had some worries on quality from other reviews but gave it a shot anyway. Took a week to arive and opened it to inspect and found one of the bell ends that goes to the cat had split when they manufactured it. They tig welded the split and ground it down and did a poor job. Should have never been repaired. AM sent a replacement overnight and it was perfect. Fit is spot on. No leaks. Install is straight forward and the factory clamps at the cats are a pain although if you have the right star socket the threaded ends are cut for one. I have the roush axle back and liked them but did not like the upper rpms as the exhaust note tends to get a more old school straight duals choppy note. The x has transformed the exhaust into a smooth howling note across the rpm range. The sound is wicked! Interior sound level is lessened and the deceleration popping is greatly reduced. Performance has changed but not confirmed on a dyno. Car is much more lively with added traction loss as an indicator. These after cat x pipes may not effect overall hp a torque numbers but they must change the curve. I noticed a difference for sure. Overall very happy with the bang for the buck and the awesome sound with added performance for 160 bucks!


    Year: 2014 Model: GT 'Stangs I have owned: 2 Seattle

    Helpful (1) (0)

  • 5/5

    Installation Time: Afternoon

    June 05, 2015

    X-Pipe Install

    I installed the x-pipe yesterday and this fit perfect and would have taken under an hour but I had to cut the existing ball/socket clamps off in order to get the factory H-pipe off of my 2011 Mustang GT. The factory clamps had the bolt head at the top of the clamp near my floor boards and side rails and i had no access for a 13mm wrench. I ordered 2 new clamps online for $19 so they came in very handy. The only issue I had was very minor exhaust leaks based on how tight I made the clamps but after driving it for awhile they should seal up and I will retighten the clamps after 50-100 miles as recommended by the manufacturer. Overall, the fit was perfect and no welding is necessary. The price is great for the purchase of an x-pipe. The only down side is that it made my mustang a bit quieter and I have GT500 axle back mufflers but it is a lower deeper tone now. Great product/great price and perfect fit.


    Year: 2011 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Pittsburgh, Pa

    Helpful (1) (0)

  • 5/5

    Installation Time: Less than 1 Hour

    January 12, 2014

    Really Nice.

    I have a 2014 gt with the outlaw axel back exhausts and this X pipe. When I first installed this I was really excited. It was a simple and quick install. I put my axel back on first and started the car to see how it would sound with out the off road x. It was loud but I wanted more. So I installed this X pipe once it cooled down and it made a big difference. It sounds amazing. It's loud and sounds very throaty and deep. But again I wanted more! I then did a resonator delete. I LOVE THE SOUND. It's really loud and just sounds amazing. Simply bliss. Couldn't be happier. My neighbor has a 14 gt as well and he has the gt500 Axel backs with a bbk x pipe. We both agree my car sounds better, and louder. I recommend this set up of you are keeping your cats and stock headers and still want a loud aggressive exhaust.


    Year: 2014 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 1 Sacramento, CA, USA

    Helpful (1) (0)

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