Definition

An aftermarket car modification that channels engine gases out while (ideally) producing a satisfying growl. When done right, it's automotive music; when done wrong by Honda Civic owners, it sounds like an angry lawnmower having an existential crisis.

Example Usage

That Mustang has a proper exhaust system—you can hear it purring from a block away.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=exhaust&defid=12048)