My air filter is the old Cylinder type so it draws in air from just behind the headlight not from the wing.
When i used to race the Focus I drew air in from the front grill so it was not heated by the bay but also the scoop kept the air temp down in the bay, the difference was noticable then the adddition of a K & N filter fitted was even better.
But may have to go for Snorkel, just thought it would be different to go for an alternative as i do not at this stage think i will be going that extreme with wading, also i always find V8's tempermental even if you do try and water proof everything..................Mmmmmmm Diesel Disco