I ran a paper filter at stage 2+ and it ran perfectly fine. Tried performance filters and there was no perceivable difference. Just change your cilter every 10k and you will be fine.
On my current car I have tried K&N and Pipercross and I still cant feel any difference in performance over std.
If you research independent filter tests; there is a 0.90% pressure drop difference between the highest flowing filter and the std paper filter. That means there is very little flow difference between them all.