If you're happy with the way your Mustang performs but want a more distinct sound, then a new muffler or axle-back exhaust will let you select your exhaust note. Aggressive, off-road exhausts create a big sound. These exhausts are awesome for track days, but may not make you popular with your neighbors. Streetable exhaust systems keep you on the legal side of local ordinances while still creating a deep rumble that you'll feel in your gut.
If you really want a bigger sound and more performance, then there's just no substitute for a cat-back exhaust system. Especially when paired with the right set of headers. Cat-back exhausts replace everything from the catalytic converter to the exhaust tips. These exhaust systems are able to reduce backpressure and have more control over the total exhaust note.
Even something simple like a resonator delete will make a huge impact on your exhaust note. Dropping the resonator also allows you to cut weight, which gives you an even bigger performance boost.
Active exhaust is one of the cool features available straight from the factory. There are many aftermarket exhaust options that will work with your active exhaust. Just because you've decided to have a "good neighbor" mode doesn't mean you don't want a little more rumble while you're on a group ride. If you missed out on active exhaust, there are even aftermarket exhausts that can give you many of the same features.
Whether you prefer a screaming-loud exhaust note that forces others to take notice or a deep rumbling exhaust that lets you stay stealthy, there's a great exhaust system for your 2018 Mustang. Exhaust modifications offer one of the best ways to customize your Mustang in a way you'll notice every time you turn the key.