On exhausts you had a nice rasp from copper/ brass tail pipes I guess inlets are the same 'sumat' to do with harmonics.
. Many moons ago, about 1969/70, I bought a second hand CB250, the first of the 5 speed models. It was plagued with carb problems so I went to Read Titan in Leytonstone and purchased a pair of Amal concentrics, fitting kit, PLUS!, a nice pair of inlet bell mouths
. . This model Honda was one of the first to be equipped with a fairly loud exhaust as standard, but when the motor started to breathe properly above 7000RPM, those inlet stacks completely drowned out any other sounds. Naughty but Nice!