as long as the vehicle is always running, water won't get into the exhaust because it will always be expelling air... like slowly blowing bubbles when snorkleing (diving). just don't stop 
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-Tim-
~I swear sometimes i feel like i'm married to a child.
~You better watch who you're calling a child, Lois, cause if i'm a child than you know what that makes you? a pedophile. and i'll be damned if i'm going to stand here and be lectured by a pervert.
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