I recently bought an 08 G37s and it came equipped with many mods including an AAM cold air intake. The only thing is I don't feel comfortable driving in the rain without a hydroshield as it rains a lot here and the Z1 filters that are currently on the intake don't have a hydroshield on the market so I wanted to buy some K&N filters instead. I was wondering what size K&N filters I would need to buy to fit on the intake that also have an available hydroshield. I don't know which K&N filters to buy but know the current Z1 filters on the intake have a 2.5 inch inner diameter and 3 inch outer diameter.

 

They sell the shield wrap pouch that fits over the filter in universal sizes