as the filter gets dirty the minder will show when the filter is being restricted.
None of them come with the hole except the e99.
The AIS has the snorkel that goes to the core support along side the batt, you cut a 3" dia hole in the end and install the sleeve. That's 2 sources of ambient air.
I cut out a portion of the core support and put screen over it.
Last trip camping my friend & I monitored the intake air temp coming home. He has an AFE II and I have the AIS. I ran consistently 30* cooler intake temp than he did. That will make a cooler, denser charge. That's good.