Hi Elliot
I used to have a hole in my old bonnet ( my car has a 2.1 pinto with a twin choke webber carb) and I had a K & N filter fitted which was ok, but when I got my new bonnet with louvre vents pressed in it meant I would have had to cut hole where Louvres were for filter so I manufactured a mild steel airbox to fit on carb, using original filter mounting holes I then fed a ducted hose from this down into nosecone, and fitted a performance cone filter to this in nose cone, result better running and cosmetic finish