who has actually changed there air box to a filter and is it worth it i have a hks panel filter at present but also an apexi to replace it with but is it worth doing, and do you need to run a feed to the filter without the box sucking in the air?

 

You don't tell us very much to assist you. Is this a Classic or a New Age?
What are your power aspirations and what are your other modifications?
If the car is relatively standard, generally, you are best to stick with your OE airbox and panel filter as this is relatively efficient and you are not breathing hot engine bay air.
I would ditch the HKS green panel filter made from foam sponge if you are keeping the car for any length of time as this filter lets through large micron particles/grit.