Yes you can do it with the stock filter.

And yes that's what he's talking about. It does direct air, but it's like sucking in air with your lips puckered up. You can't get as much air at one time with the snorkel on there

 

Ahh ok, so just the snorkle and leave the plastic cover around the filter still. Sounds like a plan and i am going out right now to take it out haha!