[Buzz]

Not only do they lower temps while running - I never have to use my fans unless I'm idling - they also drastically speed cooling of the engine compartment when you shut down. The hot air vents out muy rapido instead of baking your underhood components, electronics, hoses, etc. Supposedly, by venting underhood pressure, they have the additional benefit of reducing front end lift at very high speeds, just in case you take your car out on the track.