That filter was just something being used for the dyno testing. The actual filter used will be different, though it hasn't been confirmed what type yet. It all comes down to cost so that the overall kit can be viable and competitive....

Gasper, not sure what you mean by "is there any other position can feel more cold air?" It's not going to get much colder than in the wheel well as it is virtually cut off from the engine bay, and it receives cold air via the factory duct in the front bar.....

I had previously looked at getting an enclosure made for in the engine bay, but the size of the engine bay is very restrictive and unless you go something like the ultra expensive carbon fiber Gruppe M I can't see much else working in there (I'm talking fully enclosed options)...

It all comes down to the length of the pipe too. It wasn't just a "make the pipe to go into the wheel well and see how it goes" type effort. With an extra inch in length, that setup makes virtually the same power as the factory box!