Short Answer: There should be no concern about rain.
Longer Answer: The Corksport intake is a "short-ram" intake, not a "cold-air" intake. Short-rams take in air from the upper section of the engine compartment, while a cold-air intake will take in "cooler" air near the bottom of the bumper or wheel well. Rain is a problem mainly when *some* cold-air intakes (because of their low filter positioning) draw water up like a straw when submerged in water (such as running through a large puddle). This causes water to be sucked into the engine. Engines cannot compress liquid like it can a gas, causing the engine to 'hydrolock', and therefore cause mechanical damage. In order to hydrolock a car with a short-ram intake, you would have to have water running over your wheel wells and engine block. Which, if this happens, hydrolock should be the least of your concerns. (boom06)