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I owned a 335i, a 1M and currently drive a M135i. All are 3L turbo variants. Of these, only the M135i does have active sound, and I like it.
It allows you to experience the engine note, without pedestrians making gestures at you that you're a lunatic driver.
In other words: it doesn't scream at the outside anymore, but it can still be heard well inside the cabin.
Also: it's not like you really notice this active sound feature. Infact, if noone told you, you'd never know. Just saying it's not trying to emulate any non-natural sound. It's more like adding 10 decibels to the actual sound level...
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