I got this when I bought my track trailer from a gentleman that sold his Boxster.
The cone filter has "aFe" printed on it, but I don't see any branding on the rest of it, and it doesn't look like the current AFE CAI offering which doesn't have a cone filter.
Comes with everything you see here, and you can have the extra snorkel that is half way off the top of the picture too if you want it.
I don't know anything about it and it didn't come from off my Boxster, but I know it did come off a 986 Boxster, unsure which year.
$65 PP and shipped in the US.
No returns - everything I know about this unit is disclosed here in this thread. What you see is what you get

And unfortunately I can't offer any installation advice, but it does look somewhat like the one described in the 101 projects CAI article and there are some installation steps there:
http://www.pelicanparts.com/techarticles/Boxster_Tech/23-FUEL-Cold_Air_Intake/23-FUEL-Cold_Air_Intake.htm
I can however take any kind of measurements of these items if you like. I don't have my car right now (at the shop getting some suspension work) but when I get it back I can take some pictures of these parts kind of laying on top of the other parts?