i've jus installed my new k&n filter and removed the stock air box

heard from some ppl that unless theres an air box of somekind, its prob illegal

anyone here made their own air box around an aftermarket filer?
or didch just cut some bits out of the existing stock one?
or was there some kind of aftermarket replacement air box thats avaliable that included some kind of piping attached to suck air from under the bonnet

any pics or references would be useful

thanks