Instead of a pod, have you considered a K&N replacement panel filter? That way you maintain the acoustics of the original airbox and inlet tract, and it keeps the engine bay looking smart and original. Theres a lot of engineering involved in designing an intake tract, why mess with it?
Since, on the inlet side of things, power is liberated through increased airflow and reduced temperature, I think it simpler to use a performance panel filter to increase airflow, and retain the original cold air feed to the airbox. I guess if you like you could make an additional cold air feed to the airbox.
Who knows, with a high-flowing panel filter instead of a pod, you may get the increased airflow that your after, but without the strange loss of bottom end some people are experiencing.
Otherwise, with a pod, you would need to make an enclosure PLUS a cold air feed.
Again, personal preference comes into it all. I like to keep things looking original. B)