Do you really want to start an air filter war? I suspect no one knows for sure what the effects or lack thereof are, but there is enough evidence that they don't filter as well to cause me concern. You can go with a traditional paper cone filter by fabricating an appropriate bracket and going with a catch can.
I did both on my swap and while it does a great job I can't hear my turbo...even with the relatively "open" filter configuration. (I needed to do it due to space considerations not anything else)
Here's my setup
A little searching will turn up lots of interesting solutions.