Ram air scoop??
That's one of the best ones I've heard.
The scoop is for the intercooler on the WRX models, it was put on the RS to make it more agressive looking.
As for functional, it is functional on the Impreza turbo, on the RS it is simply cosmetic.
There has never been any consideration towards making it 'functional' beyond its original design.
What would you like its function to be?