I have never lived in St. Louis, so i don't know what the weather is like. But, if your filter is submerged in water, then, yes, no shield would help you prevent hydro-lock.
I have driven through pooring rain here So. Cal, and I have had no problem with my Injen CAI
If water is high enough to submerge the filter when it rains in St. Louis, then don't take the chance. [ 08-07-2002, 12:48 PM: Message edited by: tony ]