We've had some threads regarding the way the Mirage sounds. I say that so you could look them up if you care to. They're fairly entertaining threads.
Except for the fact that the Mirage engine is muffled and quieter, with just the right exhaust system (and I don't know what that would be), I would think the 3-Tapper would sound a lot like a 2-Stroke in-line 6 cylinder diesel.
I think those old school 2-stroke diesel engines are just bad to the bone, as in the cool factor. Not a great engine (for power and efficiency) compared to some of the later Pre-emissions built diesel engines, but waaaaay cool.
I like the fact that the 3 cylinder sounds a lot like those. Just wish I could make mine just a skosh louder, without getting too fart cannish. I haven't experimented since I still have powertrain warranty. Not that an exhaust would void it necessarily. But I'm also broke, busted, splintered, shattered, scattered, smothered and chunked. So I haven't messed with it.
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View my fuel log 2020 Mirage ES 1.2 manual: 42.4 mpg (US) ... 18.0 km/L ... 5.5 L/100 km ... 50.9 mpg (Imp)