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JBA After-Cat H-pipe - 3 in. to 3 in. (11-14 GT)

AmericanMuscle no longer carries the JBA After-Cat H-pipe - 3 in. to 3 in. (11-14 GT). Please check out 2010-2014 Mustang H-Pipes for an updated selection.
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AmericanMuscle no longer carries the JBA After-Cat H-pipe - 3 in. to 3 in. (11-14 GT). Please check out 2010-2014 Mustang H-Pipes for an updated selection.

Features & Details

  • Improves Exhaust Flow for More Power
  • Classic Muscle Car Sound
  • Free Flowing Mandrel-Bent Stainless Steel
  • 3" to 3" Tubing
  • Smog Legal - When Reusing Your Stock Catalytic Converters
  • Off Road Use - When Using the Included 3" Cat Delete Downpipes
  • Fits 2011-2014 GT Mustangs
Improves Power. Add even more horsepower and torque to the rear wheels of your 5.0 coyote Mustang with a JBA After Cat H-Pipe. The JBA high flow H-Pipe significantly improves your GT's exhaust flow to increase overall performance. This JBA H-Pipe is designed to be used with JBA's shorty headers or the stock manifolds.

Muscle Car Rumble. This free flowing JBA Mid Pipe for your 2011-2013+ 5.0-powered GT not only increases power, but it also adds a deep muscle car rumble to the sound of your exhaust with its classic "H" crossover pipe design.

Street Or Off-road Use. The JBA GT H-Pipe bolts up directly behind the stock catalytic converters with no cutting required making your Mustang 100% smog-legal. Or you can install the included stainless steel "cat delete" downpipes for even more power making your h-pipe perfect for off-road use.

Quality Construction. The JBA After Cat high-flow H-Pipe is made to last using durable 3" stainless steel tubing. The tubing is mandrel-bent so there are no kinks to rob you of power.

Required Upgrade. This 3" to 3" Mid Pipe requires the use of an aftermarket 3" catback exhaust system, as the factory catback is too small at only 2.75".

Application. This JBA high flow After Cat H-Pipe is designed to fit the 2011-2014 GT with either the stock exhaust manifolds or aftermarket shorty style headers installed. Reuses the stock Catalytic Converters for smog legal use.
What's in the Box
  • (1) H-pipe
  • (1) Clamp
  • (4) Bolts
  • (4) Nuts
  • (2) Catalytic converter delete pipes
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: Standard "H" Type Headers Required: Shorty or Stock Manifolds
Piping Material: Stainless Steel Piping Size: 3"
Catalytic Converter: Reuses stock Catalytic Converters Fitment: 2011-2014 GT Mustangs

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5 Questions / 5 Answers

Ask a Question

Do jab longtube headers work with these ? I don't want to use an x mid pipe , I'd rather have an h pipe and they don't have a shorty h pipe on the drop down option .


  • The JBA After-Cat H-pipe - 3 in. to 3 in. (11-14 GT) is not designed to work with long tube headers so you would be forced to modify your exhaust to make this work. Because you have long tubes you need to compensate and get a shorter mid-pipe. The only mid-pipe we have to offer that works with the JBA long tubes is that X-pipe you were mentioning.


Helpful (1)

My car has factory exhaust except for the pypes axle back, will this fit or do I need the one that reduces to 2.75?


  • Since this JBA After-Cat H-pipe utilizes 3.00" piping, and your factory can back is 2.75" piping, this H-pipe would not be compatible. We would highly recommend a h-pipe or x-pipe that can be utilized with the factory cat-back exhaust. JBA does offer an After-Cat H-Pipe that does reduce to 2.75", item 23136.


Helpful (0)

Will this H-pipe just replace the factory pipe and also fit the Flow Master Street cat back exhaust?


  • Hello Keith, The H-pipe is designed to fit the stock manifolds of a shorty header as well as any after market 3" cat back. I'm not sure if you were looking at Magnaflow "street" or flow master Outlaw/American Thunder/ or force II set up but they all are 3" piping so they should line up with the H-pipe just fine!


Helpful (0)

are the off-road h-pipe louder than the catted version? Is it alot or alittle?


  • The off-road versions are always going to be louder than the catted. This is because the catalytic converter highly dampens the sound. The off-road pipe is going to be a significant amount louder than the catted version.


Helpful (0)

Work With Roush Axle-Backs ? All I have for exhaust upgrades are my Roush axle-backs.....will this H pipe bolt up directly to these?


  • The JBA After-Cat H-pipe - 3 in. to 3 in. (11-14 GT) will not work with only axle backs. This kit will need a 3" cat back system for the H-pipe to be installed.


Helpful (0)

Customer Reviews (4) Write a Review

Overall Rating 5

out of 5 stars

Installation Time:Afternoon

  • Loudness / Volume 4.75 4.8
  • Exhaust Note 4.5 4.5
  • Fit & Finish 4.75 4.8
  • Bang For Your Buck 4.75 4.8

  • 5/5

    Installation Time: Afternoon

    May 08, 2017

    Great sound

    It fit perfect stock clamps did not work very good. I ended up cutting stock pipe back to get 3" all the way to the mufflers and added 6" piece on each side and used 3" bands it worked great


    Year: 2014 Submodel: GT

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    October 22, 2015

    Great product

    Very easy to install. it took me 4hrs to install, not because it didn't fit, but because the catalytic converters nuts all stripped. there is no room really to play with underneath the car.


    Year: 2014 Submodel: GT U.S. ARMY Baumholder Germany

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    July 01, 2013

    great exhaust note

    Price wasn't too bad, had this installed along with magnaflow magnapack mufflers and it sounds absolutely amazing especially once it starts revving up, I recommend this product.


    Year: 2012 Submodel: GT GSB, Goldsboro, NC 27531, USA

    Helpful (2)

  • 5/5

    Installation Time: Less than 1 Hour

    March 06, 2012

    GREAT Product!

    Installed this myself on my '12 GT in the garage with jack stands. The hardest part was getting those 1/2" bolts off the front pieces of the stock h-pipe, their upside down! (HINT: Loosen them with a wrench then use a set of vice grips on the end of the bolt to turn it off) Classic throaty sound, deep yet loud. Hooked them up to my GT500 Axle back with resonators cut (3" pipe in their place) SOUNDS AMAZING! No drone and not overwhelming when cruising on hwy.


    Year: 2012 Submodel: GT USA

    Helpful (6)

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