I doubt that; my brother had the exact same problem with a stock intake(D15B7 replacing D15B8). His actually ran OK in rain until I hit a huge puddle while driving it(under-body splash guards are gone). The motor did not hydro-lock. There was no immediate effect but what it did was maybe like 5-10mins later the engine would just feel very weak(like it wasn't getting fuel) and idle would drop very low, would go back to normal, then do it again; I think only twice did the engine die(you'd have to wait a couple minutes until you could start it back up). When the weather would dry up, the car would run fine. This went on for about 3-5weeks.
Found out, it was the O2 wires; when putting in the D15B7 we had to switch from 1-wire to 4-wire O2 sensor, and the connections were exposed. Waited for a warm dry day and just covered everything with dielectric grease+electrical tape. I also opened up the distributor to make sure it was dry. No issues after that.
