bro
u can install 1 real bov in ur NA engine
but it is not functionable coz NA engine does not produce force more than 0 psi
so that the air does not have enuff power to produce sound
if u wan to hv the car produce forced air u make install a boost meter or a vacuum meter
then when u press ur accelerator, c whether the pointer will go over 0 n above
if ur NA engine can go above 0 then u may install a bov
but as i know that all NA cars cant go above 0 n always under 0
as others say
if u really don mind that a turbo car smoke u, u may install a bov