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Don't quote me but sound deadening will increase from series to series, 7 likely the highest. This is the big one, some luxury models even come with active sound deadening.
Tire compound and even tread pattern play a decent role as well. Ever hear a knobby tire'd jeep drive by? Even Teslas aren't immune to tire noise.
Soft top convertible vs hard top convertible vs fixed roof should be obvious.
I did notice my '06 3 series is quieter than my friends newer subaru / VW at least.
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