I haven't done. Budgeting stage only... KNN Apollo CAI costs around 500. So I calculated custom made one with simota filter element would be around 300. Maybe end of this year do la if everything goes well. Items required:
short ram stainless steel pipe and silicone hoses for piping
metal clips for attaching/joining silicone hose and stainless steel pipe
simota open pod air filter element with compatible CAI cone heat shield (cap ayam) OR
directly get a simota open pod with its CAI cone heat shield
1 meter CAI flexible plastic hose (chose the ones with ends that can plug into/fit the CAI cone heat shield)
I attached some pictures of the KNN Apollo CAI. You can see in the first picture the CAI hose disconnected from the cone heat shield and in the second picture, it is connected.
http://www.lotustalk.com/forums/attachments/f95/127825d1248011423-fs-k-n-apollo-intake-k-n-intake-001.jpg
If you can get a cone heat shield that can fit nicely with the CAI hose, and then route the CAI hose to the bumper front, then OK!!!
I'm still trying to source stuff and experimenting...