Thanks for your inputs guys.
Here is some info for you.
During the rain, water does get in the engine bay, and it's no problem unless you have an exposed air filter. In that case, you can have one or both sides sealed during production.
Also, the center vent is actually designed to vent heat from where the engine bay collects it most, which is right behind the radiator! We have done extensive testing on the 335i, which has the same motor as the 135i, and determined this to be the best place.
Thanks!
JL
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