Personally I use Amsoil's intake filters. They have a bunch of different sizes that should fit any aftermarket "cone style" intake system. These have a really good filter media, and they don't have that silly metal cap that dislodges and gets sucked into the turbo. I know it looks like they have it but they don't.
https://www.amsoil.com/shop/by-produ...ction-filters/
Just look through the available sizes and determine what will fit your setup best.
Also i've been informed that Amsoil is going to discontinue this line of intake filters due to low demand. So get them while you can!
I run two on my vq s13, one on my sr s13 and a massive one on my 5.9 cummins.