The actual height of the conventional snorkle is beneficial in terms of colder air intake and dust ingestion whilst in convoy...to put that intake in the RR vent would only be as beneficial as adding 3 inch flexible pipe to the existing air cleaner and venting it to the face of the grille.
When I had my RR I made the mistake of putting a pod filter on it, looked wankey but all it did was suck hot air from the engine bay.
Snorkle manufacture for Rangies is easy.. 3" mandrel bent S/steel pipe, some Flexible wire re-in forced Rubber hose , and Head unit.
remember when cutting you guard it has to be an oval shaped hole not a 3" round one;)

