News: 2015 Mustang Exhaust Dyno

2015 Mustang Magnaflow Dyno Featured

Loud and Proud

See and hear a 2015 Mustang GT run on the chassis dyno with Magnaflow’s new Competition cat-back

By Steve Turner
Photos courtesy of Magnaflow

If you are a regular SVTP Front Page reader—and shame on you if you aren’t—you know that we broke the news about the availability of Magnaflow’s lineup of cat- and axle-back exhaust systems for the 2015 Mustangs in all their powertrain flavors. What we didn’t know at the time was how much power could be gained by adding one of these systems. Now, in the case of the 2015 Mustang GT, we know the gains are big.

As you can hear in the video, the Magnaflow Competition cat-back sounds aggressive. According to Magnaflow reps it’s not really loud at all inside the car, but don’t be deceived. Everyone will hear you coming.
As you can hear in the video, the Magnaflow Competition cat-back sounds aggressive. According to Magnaflow reps it’s not really loud at all inside the car, but don’t be deceived. Everyone will hear you coming.

To refresh your memory, Magnaflow is offering full cat-back systems that replace the factory post-cat piping, resonator, and mufflers. These 3-inch, mandrel-bent systems are built from 100-percent stainless tubing and feature polished, 4.5-inch tips. Depending on how much volume you want, the systems are available in both Street and Competition versions. The Street version keeps the volume below 95 decibels, while the Competition version turns it up above 95 db.

Of course, you’ve been waiting to see a 2015 Mustang run on the dyno. Now you can see and hear one with the Magnaflow Competition cat-back and get the dyno results. Check out the video here:

This is what we have all been waiting for—before-and-after runs on a Dynojet. The 2015 Mustang GT put down around 370 horsepower and just over 350 lb-ft of torque in stock form. According to Magnaflow, it picked up a stout 30 hp and 25 lb-ft at the wheels with the Competition cat-back.
This is what we have all been waiting for—before-and-after runs on a Dynojet. The 2015 Mustang GT put down around 370 horsepower and just over 350 lb-ft of torque in stock form. According to Magnaflow, it picked up a stout 30 hp and 25 lb-ft at the wheels with the Competition cat-back.

The cat-backs will be available soon, but you can preorder them now from a Magnaflow retailer for $1,199. If you preorder soon, you’ll be eligible for a free Magnaflow hat (while supplies last).

Magnaflow also offers axle-back kits for those just looking to add mufflers. The retail for $760.28 and offer a similar sound.

If you were skeptical about the results, here is the sheet right out of the Dynojet. The car was run in Fifth gear and the smoothing is turned up, which reduces any spikes in the curve.
If you were skeptical about the results, here is the sheet right out of the Dynojet. The car was run in Fifth gear and the smoothing is turned up, which reduces any spikes in the curve.
The system you hear and see in the video is the Competition system. It takes the exhaust volume past 95 db—at least on the outside of the car.
The system you hear and see in the video is the Competition system. It takes the exhaust volume past 95 db—at least on the outside of the car.
We don’t know the dyno results for this system yet, but if you don’t want to wake the neighbors every time you pull out of the driveway, Magnaflow’s Street system is your likely choice. It holds the exhaust growl below 95 decibels.
We don’t know the dyno results for this system yet, but if you don’t want to wake the neighbors every time you pull out of the driveway, Magnaflow’s Street system is your likely choice. It holds the exhaust growl below 95 decibels.
The test car is a Performance Pack-equipped 2015 Mustang GT with a manual trans.
The test car is a Performance Pack-equipped 2015 Mustang GT with a manual trans.
The polished 4.5-inch tips look great in the S550 rear valance.
The polished 4.5-inch tips look great in the S550 rear valance.

 

From this angle you can really see how big those tips are.
From this angle you can really see how big those tips are.
When you hear the term “cat-back,” you think of just mufflers, but due to the nature of the S550 exhaust, this system really is a mid-pipe and a cat-back all in one, as the stock cats are at the front of the system.
When you hear the term “cat-back,” you think of just mufflers, but due to the nature of the S550 exhaust, this system really is a mid-pipe and a cat-back all in one, as the stock cats are at the front of the system.
Not only does the factory system have a bulky resonator, but the piping isn’t of a consistent diameter, so the restrictions are numerous, and this 3-inch Magnaflow system removes them.
Not only does the factory system have a bulky resonator, but the piping isn’t of a consistent diameter, so the restrictions are numerous, and this 3-inch Magnaflow system removes them.
Magnaflow's Competition Axle-Back system retails for $760.28.
Magnaflow’s Competition Axle-Back system retails for $760.28.

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13 thoughts on “News: 2015 Mustang Exhaust Dyno”

  1. No way a cat back is picking up 30RWHP. Something is fishy here…

    ^^^^^ This….I smell bullshit. Now, the stock intake looks a bit more restrictive in pics than the 11-14s though….

  2. Yeah but I find it hard to believe that box is robbing 30RWHP.

    Multiple factors apply to the restriction, the piping size off the manifolds and for the whole exhaust is actually smaller than 2014, the cars have a super restrictive mufflers that are likely in place to keep it quiet for global standards, as well as the 3 muffler/resonator set up as opposed to the 2 muffler set up we are used to seeing on Mustangs.

    No trickery here, no other mods were on the vehicle – bone stock with less than 30 miles on it, dynoed in 5th gear with 1:1 ratio.

  3. Multiple factors apply to the restriction, the piping size off the manifolds and for the whole exhaust is actually smaller than 2014, the cars have a super restrictive mufflers that are likely in place to keep it quiet for global standards, as well as the 3 muffler/resonator set up as opposed to the 2 muffler set up we are used to seeing on Mustangs.

    No trickery here, no other mods were on the vehicle – bone stock with less than 30 miles on it, dynoed in 5th gear with 1:1 ratio.

    Awesome!! Thanks for clearing that info up!!

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