Air filter size. (cone)

[mikefocke]

You have a cold air intake in the stock Boxster in that air from outside the hot engine compartment is what is fed to the cylinders.

I think what you are asking about is a "low restriction" filter. Every test I've ever read that was conducted by an impartial publication showed that such filters let in more dirt and particles of smaller size than the stock filter. So you give up something to get something.