Tech: 2015 Mustang Exhaust Test

2015 Mustang Gibson Exhaust Test Featured

’Back in Business

Latemodel Restoration puts Gibson’s S550 cat-back to the test

By Steve Turner
Photos courtesy of Latemodel Restoration

New car reviewers put a lot into discussing the way a car sounds. For us, how the car sounds is really just a baseline. There’s no need to get that worked up about the stock sound, as we can promise it will almost always be too quiet.

After disconnecting the battery, start your exhaust modding by removing the post-cat clamps and removing the stock exhaust. So long suitcase.
After disconnecting the battery, start your exhaust modding by removing the post-cat clamps and removing the stock exhaust. So long suitcase.

Right there with us is the crew at Latemodel Restoration. They didn’t wait long to put the company’s Triple Yellow Mustang GT under the modding knife. After installing a set of DF5 wheels, they got down to the power mods with a full cat-back exhaust from Gibson Performance Exhaust.

“The complete, dual, 3-inch, stainless steel X-pipe and trusted, power-proven SuperFlow mufflers with integrated CFT technology will create symphony under the chassis, as they work in tune to push any driver deeper into their seat,” Gibson enthused. “With each rap of the throttle, the throaty sound exiting from the dual, 4.5-inch, intercooled stainless tips will work to alter their ego from Office Clerk to Road Warrior.”

If you’d like to hear the system, you can listen right here:

While the sound is obviously a really important part of an exhaust upgrade, the Latemodel Restoration team loves adding power too. As such, they baselined the car on the company’s in-house dyno before installing the Gibson system and testing it again. Here’s the video proof:

After installing the X-pipe using the factory clamps, slide the axle-back piping onto the mid-pipe and into the stock hanger by the axle. The Latemodel crew found it easier to unbolt the rear hanger and install it on the muffler first. Then they could bolt it in place. Repeat these steps on the passenger side.
After installing the X-pipe using the factory clamps, slide the axle-back piping onto the mid-pipe and into the stock hanger by the axle. The Latemodel crew found it easier to unbolt the rear hanger and install it on the muffler first. Then they could bolt it in place. Repeat these steps on the passenger side.

“This 2015 Mustang Gibson cat-back exhaust kit not only gives you a great horsepower increase, it also adds a throaty exhaust tone,” says Latemodel Restoration. “It features an X-pipe and Superflow mufflers to help get maximum performance. It is finished off with 4.5-inch, black intercooled tips to give the rear of your S550 a stealthy new look.”

If you are interested in the upgrade, we thought we’d bring you a few highlights of the installation, as well as the before-and-after dyno graphs.

With the axle-back lined up and hanging, you can clamp the axle-back to the mid-pipe. You’ll want to check and re-tighten the clamps after 50 miles of driving.
With the axle-back lined up and hanging, you can clamp the axle-back to the mid-pipe. You’ll want to check and re-tighten the clamps after 50 miles of driving.
With the six-speed running at 1:1, the Latemodel Restoration 2015 Mustang GT baselined at 376.24 horsepower and 358.75 lb-ft to the rear wheels. It did so burning 93-octane pump gas.
With the six-speed running at 1:1, the Latemodel Restoration 2015 Mustang GT baselined at 376.24 horsepower and 358.75 lb-ft to the rear wheels. It did so burning 93-octane pump gas.
After installing the Gibson system, the 2015 GT picked up peak-to-peak gains of 14.87 horsepower and 11.07 lb-ft of torque at the wheels. However, if you look at the area under the curve, you can see the gains were even bigger.
After installing the Gibson system, the 2015 GT picked up peak-to-peak gains of 14.87 horsepower and 11.07 lb-ft of torque at the wheels. However, if you look at the area under the curve, you can see the gains were even bigger.

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