I want to start this piece by heading off the people who will rush to the comment section to declare that the 4-cylinder isn’t a proper Mustang or that it doesn’t sound like a proper American performance car. The 2015 Mustang GT is the stereotypical American performance car and it is awesome, but some people are going to buy the Mustang EcoBoost as a performance car and with 310hp and 320lb-ft of torque, it is hard to knock the performance capabilities of the EcoBoost engine. Those people who buy the EcoBoost Mustang for performance know ahead of time that their Mustang won’t sound like the Mustang GT. However, those buyers who plan to modify the EcoBoost Mustang for improved performance will likely want it to sound a little more authoritative – and that is where Roush swoops in to save the day with their newest cat-back exhaust system for the 2015 Mustang EcoBoost.

The 2015 Mustang EcoBoost Exhaust Note

This past summer, I took a ride in a preproduction Ford Mustang EcoBoost and while doing so, I had my camera rolling. I was one of the first people to catch the exhaust tone of the EcoBoosted Mustang and because of that, a great many sites linked to my exhaust video. However, we learned soon after that some of that turbocharged engine sound was actually piped through the sound system and in reality, the EcoBoost Mustang doesn’t have all that much bark to prepare you for its bite. There is a little grumble and the faint “whirr” of the turbocharger, but in comparison to other higher performance cars with turbocharged 4-cylinder engines, the sound of the 2015 Mustang EcoBoost falls a little flat.

The video below shows a 2015 Ford Mustang EcoBoost revving the engine with the stock exhaust before moving onto another clip of the same car with the Roush exhaust – showing the incredible contrast between the two.

The Roush Exhaust for the EcoBoost Mustang

The stock exhaust system on the 2015 Ford Mustang EcoBoost is designed to offer a little grumble, but Ford designers were likely careful to avoid it sounding too much like many of the foreign import performance cars sold in the USA. Muscle car owners have long mocked the import crowd for the higher pitched, nasal sounding exhaust tone that is present in almost every high performance 4-cylinder engine – turbocharged or not.

The Roush cat-back for the Mustang EcoBoost gives the exhaust a deep, throaty tone that is significantly louder than stock, while also amplifying the whistle coming from the turbocharger. While the Mustang fitted with the Roush exhaust sounds unlike any other Mustang in the past, this is the type of exhaust system that someone buying the EcoBoost Mustang to go fast is going to want. Honestly, while I prefer the rumble of my American V8 – I love the sound of the EcoBoost Mustang with the Roush exhaust. It sounds much better than a V6 Mustang will free flowing exhaust, although it does have the expected tone that you get with a 4-cylinder engine.

Crank up your speakers and enjoy – or prepare to hate it if you insist that all muscle cars should have a throaty V8 or nothing.