Varis Cooling Bonnet - does it really cool?

2011 Nismo#91

VSII-style is the only one I have seen that seems any good.

VSII-style carbon fiber hood for 2009-2010 Nissan 370Z

In general this is the airflow for all cars. The front of the hood is low pressure, as you get to the rear the pressure increases because of the windshield. A vent far enough towards the back of the hood would slow airflow in the engine bay, it's also where most cars have their air intake for the cabin because air is being pushed down and into the vent system.

SouthArk370Z

This is exactly why most hood scoops for combustion air toward the front of the hood don't any good and can actually reduce performance. A good hood scoop is either tall enough to get into higher-pressure air (which causes a lot of drag and hinders vision) or located near the base of the windshield (and facing rearward). Front vents work better for pulling hot air out of the engine compartment.

A picture (or two) is worth a thousand words.

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Osiris

would seem the Varis hood has vent in same position

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2011 Nismo#91

It's really just my view; it could be just as good too, but the hole is smaller and the depressed area is shorter behind it.

He's been on my ignore list for awhile now. He really never has anything useful to contribute.