Indirect has that coarse sound as naturally aspirated.
A turbo will help some of that noise, also some dampening could help with comfort a bit.
But indirects often shut down like tractors with some after-idle, not instantly if you don't have a shut-down valve, i'd think?
Mercedes used the indirect injected engine very long, because it was smoother than a Common-rail
they introduced common rail first when they could make them more silent
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