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Tech: 2015 Mustang Bolt-Ons

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By EditorTurner

Tech: 2015 Mustang Bolt-Ons

Open It Up!

Adam YoBnovich’s GT makes great power with a JLT cold air, a Kooks exhaust, and a Pro Dyno tune

By Steve Turner
Photos courtesy of Pro Dyno and Kooks Headers & Exhaust

You know the feeling. Just as you drive away from the dealership in your new Mustang, you are plotting the first mod. You might even have a stack of parts waiting at home to bolt on. Sometimes, however, when the car is new, you have to wait for the aftermarket to build the parts you want. In the case of Adam YoBnovich, he only had to wait a little while because Kooks Headers & Exhaust needed a 2015 Mustang with which to design its complete system for the S550.

Adam’s car is running Kooks’ 2015-plus Mustang GT 5.0L 1 7/8x3-inch stainless steel long-tube header with a catted connection pipe (PN 1151H420; $1,830.21). These headers will accept all the factory emissions connections, and the connection pipe will mate with the factory cat-back if you wanted to keep you mods on the down low.
Adam’s car is running Kooks’ 2015-plus Mustang GT 5.0L 1 7/8×3-inch stainless steel long-tube header with a catted connection pipe (PN 1151H420; $1,830.21). These headers will accept all the factory emissions connections, and the connection pipe will mate with the factory cat-back if you wanted to keep your mods on the down low.

“Kooks contacted us looking for a customer’s car so they could R&D and test out its exhaust systems for the new S550. It just so happened that Adam had contacted Pro Dyno about exhaust at just the right time!” Jeremy Marler of Pro Dyno explained. “Adam picked the car up from the dealership and drove it straight to their shop in Statesville. Kooks had his car for about a month mocking up and switching the exhausts around. When it was done, Adam picked it up and drove it down to us to get a JLT CAI installed and a custom Pro Dyno tune.”

Clearly the fates were looking out for Adam. Sure he had to give up his new ride for a little while, but in trade he got the first Kooks exhaust system for the 2015 Mustang GT. And, by the sound of it, the wait was well worth it.

“We were more than impressed! The final numbers were 445 horsepower and 390 torque. The car is one of the best sounding of the S550s we’ve heard yet, and the numbers were great!,” Jeremy added. “Adam will be returning sometime in the next few weeks to switch up the X for an H, and we will throw it back on the dyno to see if there is any change in numbers!”

You can watch the car spin the rollers on Pro Dyno’s in-house Dynojet chassis dyno right here:

It is truly amazing that the latest Mustang can push rear-wheel horsepower in to the mid-400 range with nothing more than a cold-air intake, headers, a cat-back, and a custom tune. In the case of Adam’s car, it not only got faster but it sounds a lot better too.

Rounding out his system is one of Kooks’ 2015-plus Ford Mustang GT 3-inch, stainless steel cat-back exhausts with an X-pipe and polished tips (PN 11514100; $1,457.53). This system is compatible with either the stock manifolds or the Kooks’ long-tubes, and it features 3-inch tubing, Kooks’ polished oval race mufflers, and polished 4-inch tips.
Rounding out his system is one of Kooks’ 2015-plus Ford Mustang GT 3-inch, stainless steel cat-back exhausts with an X-pipe (PN 11514100; $1,457.53). This system is compatible with either the stock manifolds or the Kooks’ long-tubes, and it features 3-inch tubing, Kooks’ polished oval race mufflers, and polished 4-inch tips.
With a freshly installed Kooks exhaust system—long-tubes, catted X-pipe, mufflers, and tailpipes—Adam drove over to Pro Dyno for a JLT Performance cold-air intake and a Pro Dyno custom tune to make it all work together.
With a freshly installed Kooks exhaust system—long-tubes, catted X-pipe, mufflers, and tailpipes—Adam drove over to Pro Dyno for a JLT Performance cold-air intake and a Pro Dyno custom tune to make it all work together.
This is the complete Kooks system installed. It starts with the 1 7/8-inch long-tubes and flows through the catted connection pipe to a 3-inch cat-back system.
This is the complete Kooks system installed. It starts with the 1 7/8-inch long-tubes and flows through the catted connection pipe to a 3-inch cat-back system. Note that in this configuration the whole system is 3-inch, as it doesn’t use the reducer to mate the connection pipe with the stock exhaust. That adapter is shown in the product shot up top. That flexibility is a nice feature of the Kooks system.
In stock form, Adam’s GT baselined at 379.81 horsepower and 364.24 lb-ft of torque to the rear wheels.
In stock form, Adam’s GT baselined at 379.81 horsepower and 364.24 lb-ft of torque to the rear wheels.
With the addition of the full Kooks exhaust system, a JLT cold-air intake, and a custom tune by Dan Desio of Pro Dyno, the Adam’s 2015 Mustang GT put down 445.90 horsepower and 390.41 lb-ft of torque. That represents peak-to-peak gains of 66.09 horsepower and 26.17 lb-ft of torque.
With the addition of the full Kooks exhaust system, a JLT cold-air intake, and a custom tune by Dan Desio of Pro Dyno, the Adam’s 2015 Mustang GT put down 445.90 horsepower and 390.41 lb-ft of torque. That represents peak-to-peak gains of 66.09 horsepower and 26.17 lb-ft of torque.

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