What will happen if you overboost for short moment?

[YzGyz]

Howdy, I'm fiddling with my Turbosmart Street EBC and it state to set the, "Over Boost" 3lbs-4lbs over your max boost psi. In my case, that is 12lbs or so. According to the manuel, that is 14 psi. The EBC will cut boost in 1/2 (7.5lbs) if it ever spikes to 15lbs of boost as a safety. After it reads a 7.5 lbs of boost, it will resume all function like normal.

What would happen if you happen to spike to a boost level higher than what you have you car tuned to for a very short time? Or should I ask what are the chances of something going wrong if I happen to hit this safety of 15 psi.

Additional info:
-BP turbo kit
-tuned in cooler weather like 65* with some humidity
-506hp/435tq at around 12 psi
-stock engine

YzGyz