Originally Posted by 370Ztune

The Varis hood is vented, so you gain that advantage.

As far as weight savings goes:
Stock Z hood 10.0kg
Varis VSDC (Varis semi-dry carbon): 7.8kg

So you save about 5lbs between the OEM and the lightest offering from Varis.

They also make a standard wet carbon hood which only saves a couple pounds but still features the venting, as well as a full FRP hood that's about the same weight as stock.