Oh noes..another thread like this. Dude, save some dough and cut your stock rain catch and duct tape the pee pee out of it. Works the same and saves you the cash. It's that easy! Here's a link for you with pics http://forums.nasioc.com/forums/showthread.php?t=1488158 Did mine this way and have had no issues with it getting wet or sucking into my turbo. I taped mine better than this guy.
I used aluminum trim coil and RTV sealant. Better than duct tape IMO. Duct tape is known to fix everything though!