I was getting armed to reply. I think that if they were to pull air out of the engine compartment then they'd need to be mounted upside down on the inside of the hood with the narrow part pointing forward.
later,
amir
The reason this sig pic doesn't work is because Bernie says I suck at inet. =) "Man, a car full of ugly girls in an explorer tried to chase me down today, I almost vomited then floored it and got the hell away."-nadir