Hyena, i put a redback air intake on my EF XR8 which is bigger the the EL XR8 snorkle that Ghia has shown (in the pic). To be honest though, i had some problems putting it in, firstly, i had to cut a bigger hole in the airbox, and fit in an additional plastic mould that came with the intake, then, once fitted, i found that one of my belts (situated right behind the intake) was taking chunks out of the intake. To get around this, i had to cut a hole in the intake, and plastic weld a cap from the inside that would give the belt more room - lucky for me, this worked. I must say though, awsome results from this.
About the scoops, the EF XR8 scoops point out towards the windscreen, so if you think aobut it logically you could say that they where not designed to let cool air in, but let hot air out. Make sure you take the plastic covering off (thats bolted onto the bottom of the scoops) and take off any turtle back - this should allow the hot air to rise more freely, and out the scoops it goes - again, it worked for me.
Hope this helps you at all