This is the best article for support of the Festo valve / flow controller
The principal is for stock tune, doing it with an aftermarket is tricky as you are pushing the turbo harder than the tuners thought was a good idea...
Plautos did this mod to fix an issue. The N75J is to fix an issue. I don't think generally these little mods should be done unless there is a reason (fix an issue or provide better performance).
If the N75J and valve were not helping, get rid of them...
Sorry I cant help with boost numbers.
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