I've actually got the airbox, the brand is the netami gold pod filter
there is a hole where the old SMIC piping was,
of which I connected a tube for air intake under the front bar
it makes less noise with the air box but still quite annoyiny when all I want is to drive it normally
the standard airbox can be modified but I'd have to cut a large chunk out of the air intake
which will render it to be not very efficient