Ford Mustang GT Exhaust Components 2015+

In our last post, we took a look at the axleback fabrication process. Now that our prototypes are on the GT and ready to rock, it is on to testing! While we were not expecting much in the power department out of these exhaust options, we still wanted to see how they sound on the dyno.

Mishimoto's Mustang GT Exhaust - Race Axleback

Mishimoto's Mustang Axleback Exhaust - Race version

Mishimoto's Mustang GT Exhaust with polished tips

Mishimoto's Mustang GT Exhaust - Pro Axleback

Mishimoto's Mustang Axleback Exhaust - Pro version

Mishimoto's Mustang GT Exhaust - Street Axleback

Mishimoto's Mustang Axleback Exhaust - Street Version

Testing

In addition to sound testing, we will test each of our axleback options on the dyno to determine if one offers any benefit over another. This will help us to decide which option to proceed with. After making a few passes with a stock GT to determine a baseline, we ran each of our axleback options (large mufflers, small mufflers, and straight pipes) on the

Last time we wrapped up our resonator-delete testing, and with that component good to go, we're on to our next conquest, axleback exhausts. If you have not had a chance to take a look at our resonator deletes check out our blog posts HERE.

Axleback Fabrication

Any living, breathing car enthusiast knows that the exhaust is an important modification for modern muscle. Most owners want to rid themselves of the stock sound and let their pony car be heard right out of the gate. Being s550 owners ourselves, we want to hear the unrestricted growl of the Coyote in our GT, so we set out to design some axlebacks. We intend to design a few options as we want to offer an exhaust for every taste.  We plan to test a straight-pipe option for those who want to hear the GT scream, a small-muffler option for those who want an aggressive note but have neighbors, and a large-muffler option for those who like a more tame sound.

We began the design process by applying the data we obtained from the stock exhaust

In our last post, we wrapped up the fabrication of our X- and H-pipes. Now that we have some excellent looking prototypes, it is time to put them to the test. We are not expecting much in the way of power with this modification; however we still want to give these resonator deletes the rundown for sound benefit.

Mustang GT Exhaust testing

Testing

In addition to testing for any power increase we may see with our resonator delete, we will be testing our three different X-pipe designs to determine which one we will proceed with.

Mustang X-pipe testing

We loaded the GT on to our DynaPack in preparation to make some runs. We began with a completely stock GT to establish a baseline. After we let the GT take a breather, we then made several runs with the H-pipe in place of the factory resonator. We replicated this process with the three X-pipe options that were covered in our last post.

Mustang GT Exhaust testing

Results

As expected, neither the X-pipe nor the H-pipe alone made any power gains

At Mishimoto, our job is to bring you more than just exceptional cooling products. Another product category that we offer is exhausts, and what better car for an exhaust project than the fantastic-sounding Mustang GT!

The stock system on the Mustang GT sounds pretty darn good as is, but after inspection we found some ways that we could improve on the stock design. If you aren't familiar, here are some photos of the stock Mustang GT exhaust.

Stock Mustang GT exhaust

Stock Mustang GT exhaust

The stock exhaust manifolds exit into two catalytic converters, one of which is integrated into the exhaust manifold itself. Is this Ford's way of deterring the installation of aftermarket headers? The world may never know. The exhaust is 2.25" in diameter from the exhaust manifolds all the way through the resonator that you see in the photos. After the resonator the diameter of the exhaust jumps back up to 2.5". The pipes then snake past the rear differential into two mufflers at the rear with a single