Just my 2 cents here.
a real vent ? WHY ??
Is your H3 overheating ? a vent will create wind resistance aerodynamically, maybe not noticeable, but it's there. you can sacrifice wind resistance to preserve your engine if it's overheating, but if it's not, then why ?
another point is dust, with a hood vent that is going nowhere, you will spray your engine with wind dust for no particular reason.
If you have a supercharger and need to channel ram air into it, then yes the hood vent is a good idea.
but if none of the above conditions apply, why the hood vent ? as the old saying goes : "if it ain't broke......"
SledgeHummer