I tried an 'opened up' airbox on my Brabus; like I have on my
remapped CDi; but the result was totally different !
Although it had a glorious induction roar and the wastegate
type chatter on the overun that made one think it was faster,
it actually performed worse when I checked the figures out.
It was 'flat' at the top end and it even drank more go-go juice !
A couple of days later I refitted the original airbox with an
ITG filter and got back everything that was 'missing', and
what a relief that was.