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Heartthrob Straight Pipe Cat-to-Axle X-Pipe Kit (11-14 GT)

Market Price $429.99 You Save 12% ($50.00)
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  • Item 53804
  • MPN# 1029055

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Features & Details

  • Improves Exhaust Flow for More Power
  • Race Car Growl
  • Aluminized Steel Construction
  • Clamp-On Design
  • Reuses Stock Catalytic Converters
  • Uses O.E. or Aftermarket Axle-Back
  • Fits 2011-2014 GT Mustangs
Better Flow, More Power. Ford actually did a decent job on the Mustangs catalytic converters, but the stock H-Pipe is pretty restrictive. That's where the Heartthrob Straight Pipe Cat-to-Axle X-Pipe Kit comes into play. Featuring a X crossover and 3" free-flowing mandrel-bent piping, this Heartthrob Mid Pipe will dramatically improve exhaust flow for more power and sound that you can feel.

Race Car Growl. This free flowing Heartthrob Cat-to-Axle X-Pipe Kit for the 2011-2013+ GT Mustang's 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 installation of the Heartthrob Exhaust cat to axle system requires removing the stock exhaust piping from the catalytic converters back to the axle-back, and reuses the factory catalytic converters saving you money. Clamps and instructions are provided.

Versatile Design. The unique design of the Heartthrob Cat-to-Axle exhaust kit allows you to install the axle-back of your choice. You can keep the stock mufflers for a mild sound or go with a set of muffler deletes for a wild sound. The choice is up to you.

Durable Construction. Heartthrob uses free-flowing 3" diameter CNC mandrel bent aluminized tubing with a merged X crossover and high flow straight pipe design to improve exhaust flow to provide a significant increase in power and sound.

Application. This Heartthrob Straight Pipe X-Pipe Kit is designed to fit the 2011-2014 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) X-pipe
  • (2) Down Pipes
  • (2) Over axle pipes
  • (2) short pipes
  • (10) Clamps
Installation Info
Tech Specs
Mid Pipe Specifications
Style Mid Pipe: "X" Type Headers Required: Shorty or Stock Manifolds
Piping Material: Aluminized Steel Piping Size: 3"
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


This is nice x pipe that fits together nicely. There's a lot of different pieces to it so it makes it hard to put in by your self. The clamps that come with the kit do not clamp down tight enough and connections ...

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Helpful (11)

a sound of its own not over powering just a darn good sound

i have a 2011 roush and thought it sounded pretty darn good but with the cat to axle heartrob the car now has a voice of its own i it is not over powering loud just a great growl that sounds amazing would ...

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Helpful (3)

Overall Rating 3.8 out of 5 stars
Read All 13 Reviews

Customer Photos (3) Submit Your Photo

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Q & A

Ask a Question

if I remove the X pipe on this kit, will the over axle pipe bolt up to my kooks x pipe?


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Customer Reviews (13) Write a Review

Overall Rating 3.8

out of 5 stars

Installation Time:Full Day

Installation Cost:$100-$250

  • Loudness / Volume 4.416667 4.4
  • Exhaust Note 4.416667 4.4
  • Fit & Finish 2.833333 2.8
  • Bang For Your Buck 4.416667 4.4

  • 3/5

    August 23, 2011


    This is nice x pipe that fits together nicely. There's a lot of different pieces to it so it makes it hard to put in by your self. The clamps that come with the kit do not clamp down tight enough and connections are loose. So you will have to go and buy the U bolt style exhaust clamps.


    Year: 2011 Submodel: GT

    Helpful (11)

  • 5/5

    Installation Time: Shop Install

    December 07, 2011

    a sound of its own not over powering just a darn good sound

    i have a 2011 roush and thought it sounded pretty darn good but with the cat to axle heartrob the car now has a voice of its own i it is not over powering loud just a great growl that sounds amazing would recommend this this product to any mustang owner


    Year: 2011 Submodel: GT holly springs n.c.

    Helpful (3)

  • 4/5

    Installation Time: Less than 1 Hour

    June 14, 2013

    Awesome Exhuast Note

    Installed in about an hour. Had a few minor fit and finish issues. The drivers side pipe to cat was very hard to get into place and the left pipe to axle had the end slightly bent in shipping. Over all install went well no issues with clamps leaking. Sounds great, but did not seem to get louder even with straight pipes to Magnaflow axle back. Also no drone at cruising speed on interstate.


    Year: 2013 Submodel: GT Jacksonville, FL

    Helpful (2)

  • 5/5

    Installation Time: Shop Install

    February 24, 2012

    Great considering the other options out there

    I had magnaflow muffler deletes already installed but wanted a full catback system-- heartthrob and jpc make the only over axle pipes that I one can purchase without having to buy an entire cat-back system just to use part of the included parts. Only required a couple cuts but otherwise my car sounds much more throaty and deep- and the x pipe adds a nice bit of growl.


    Year: 2011 Submodel: GT Fairview, TX

    Helpful (2)

  • 4/5

    Installation Time: Afternoon

    February 23, 2012

    Great sound, not-so-great install process

    I purchased this kit back in November during AM's Cyber Monday Sale. The day after I got it, I attempted to install it onto my car, in my driveway on ramps and jack stands. It took roughly 3 hours on my back lining up piping, banging it all together, and making sure everything fit properly. Everything did with varying degrees of difficulty, except the front "Euro-clamps", or simply band clamps, around the ball & socket which attach it to the catalytic converters. They DO NOT fit properly and cause a nasty leak right under the seats, making it very noticeable and annoying. I tried to have a local shop fix it by tightening the clamps with a 4-foot breaker bar, but the leak was still there. While they were under the car, they told me my install alignment was all off, so they re-aligned it for me, costing me $100. After this, I took the car to another shop to get that welded, which involved dropping the entire system, costing me another $150. So in total, I spent $220 on the kit, $250 on the install issues. My word of advice is to not try to do this yourself, and spend the money to get it done right the first time, and save yourself some aggravation. Despite all my issues, I would recommend this product. It is a great kit, quality of the piping is awesome, looks & fits very nicely, and made my 2011 GT with Borla S-Type mufflers sound amazing. Just get it installed right, and everything is all good.


    Year: 2011 Submodel: GT Stamford, CT

    Helpful (2)

  • 4/5

    Installation Time: Less than 1 Hour

    December 07, 2011

    great product for the price

    Install was easy. Only issue is where the front pipes meet the flanges for the factory cats there is a leak on both sides. The 3 in. pipe doesn't mate well with the cats. Local muffler shop tried to make it better but made it worse. The ball flange was off center on both pipes so it doesn't seal well and if you over tighten the euro clamps it pinches the 3 in. pipe and cause a leak. That said, the sound is great under throttle throttle GT 500 mufflers and actually quieter at idle. I am very happy with the fitment of the system except the above mentioned issue. It's a very nice kit and looks good under the car.


    Year: 2012 Submodel: GT GrandBay, Al.

    Helpful (2)

  • 5/5

    Installation Time: Afternoon

    July 27, 2015

    I think these are making all the noise in the car

    I wanted to replace the muffler and decided to "improve" the smaller stock pipe with something bigger. This is it - this is now the biggest sound in the car. It was pretty easy to install, there was no welding needed with the included clamps. Although I did have to "lengthen" a hang bracket so these would hang a little lower. My product was a true X pipe, not exactly what they are showing in the photo. Think of these paired with a set of BBK Vari-Tunes - that's what I hear.


    Year: 2014 Submodel: GT SE. Michigan

    Helpful (1)

  • 4/5

    Installation Time: Less than 1 Hour

    May 14, 2015

    Just a little bad fit

    The product is great and worked well exactly with the setup I wanted but I just a problem really having it fit good over the axle and I still do it hits the axle and chasse when I take bumps still but I'll have to fix that myself not sure if that was a instlation problem


    Year: 2011 Submodel: GT Germantown Maryland

    Helpful (1)

  • 3/5

    Installation Time: Shop Install

    Installation Cost: $100-$250

    June 05, 2012

    Good exhaust flow, bad measurements

    This kit is easy on the wallet and sounds fantastic with Bassani axle backs! The only down side is that my exhaust guy and I measured the piping and it was about a foot too long. The flares to connect to the cats were not measured to fit properly, so he had to cut them off and weld them to the existing flanges. Also the the bent in the over axle section was too high and it interfered with a fuel line, so that was reworked to fit properly. Overall, I would not recommend you tackle this system without a saw and welder nearby.


    Year: 2011 Submodel: GT Houston, TX, USA

    Helpful (1)

  • 4/5

    Installation Time: Afternoon

    April 28, 2012

    Decent but would never purchase another heartthrob product

    Poor fit at every joint. Ended up having to weld everything together rid of leaks. The flanges at the cat were not even close to sealing properly. Never again


    Year: 2011 Submodel: GT

    Helpful (1)

  • 3/5

    Installation Time: Afternoon

    August 04, 2017

    Decent sound for the price

    This a fairly good sounding system for the price but the fit is less than perfect. I wouldn't recommend it if your car is lowered more than 1.5" in the back. This is because the over axle pipes do not have the same bends as the stock pipes do and therefore do not allow for the full range of motion of the rear axle without it hitting the pipes. And on top of that, all the places where the pipes connect to each other are quite tight and take some serious force to put together. However, that being said if you are on a budget and don't get frustrated easily its a great start to a full straight pipe system.


    Year: 2011 Submodel: GT

    Helpful (0)

  • 1/5

    April 23, 2017


    These are trash they don't line up they hit the axle hang too low and When I got them installed my axle backs were completely off alignment and at that point it was too late to fix them because my clamps were already tightened


    Year: 2014 Submodel: GT

    Helpful (0)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    August 27, 2015

    hearthrob ota pipes

    I bought my exhaust separately cause i can't spend almost $1000 on a good catback,so this was one of the pieces of the puzzle,it came in intact good condition.comes with all the hardware you'll need.clearance over the axle is a problem,you'll hit the pipes over big bumps,but for the price can't complain.overall my car sounds good and i am satisfied with the product.


    Year: 2014 Submodel: GT Sacramento,CA

    Helpful (0)

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