Can 9000 help!

could someone please explain to me how in the hell you connect the can 9000 to the 4 inch flange. I've tried everything and there's no way to properly connect it.

CAN has an FAQ showing assembly. http://canfilters.com/faq.html (scroll down)

Maybe a photo of how that's not working for you?

Oh wow so it looks like you have to actually drill the holes yourself through the flange and filter, lol lame