Need help to choose from 1 of this?

[VehiGAZ]

The roads in Costa Rica are such that aerodynamics don't really come into play - but 3 ft of water does...

[Gussie2000]

Whoa, wait a minute....

If I am reading this right, you are looking at adding a roof vent? Ok, no biggie, but understand, you are looking at "hood scoops" there. You mount a giant STI scoop (picture 1) and I can almost guarantee that your aero will be !@#$ed beyond comprehension. You need to look at the Spec C type vent for the WRX/STI. Way more low profile and made to function (if installed properly).

http://www.cardomain.com/ride/2396639

I seriously wouldn't put a hood scoop on my roof, especially as an engine air intake. In rally, they are for interior cooling/circulation, not engine related.

This is not only about the hood scoop itself,but modifying the roof;Costie will need to modify the front side of the roof to fit the scoop,which mean creating a sort of boxie looking mod,run air ducts from there to the left side of the roof,I don't know how he would fit air ducts within the roof & headliner (another required mod) + the VX's head clearance is limited that means less head room & less windshield sight & destryoing the headliner.I don't see that good at all.
I may be wrong,probably costie might have another setup,but after looking at my own VX picturing that mod I don,t see the VX's excelent aerodinamics design any more