Originally Posted by Extreme Dimensions
When driving, it would be pretty tough for water to get in there since the hood is vented the opposite direction. It would be fine for some water to hit the engine when stopped and the direct contact with hot engine components MAY cause some steam. I would not recommend leaving it out unprotected during severe weather as it can cause more harm than good.
You have a point there. I guess the safest way is to go with the OEM style..