I'm not fully understanding how it causes an overboost.
If you hook the setup up, then start at wg pressure, then start tightening the mbc and stop when you get to the desired boost pressure....when does the overboost start?
i've had mine hooked up with that port going to the inlet, with that port on the ebcs open to atm, and with that port plugged and didnt notice any differences. However, I didnt do them all back to back as a test
I still refer back to my analogy of the ext wg's....cause people set them up differently and some folks say they dont work unless you have the top port connected....some say they dont work if they are connected....some say it works better one way vice the other.
If you read back through this thread you'll see people who cap it, people who vent it, and people who run it back to the intake. and theres also people that say each way doesnt work.
Bottom line is if the mbc is controlling the boost.....then its working, no?