Most cars without any from of restriction (decat + performance exhaust) seem to get around 1.3-1.4 barg. They use a restrictor ring to limit this to a (considered) safe level of around 1.1-1.2 barg.
I would be interested to see what sort of boost you get without any boost controller, but would think that you could probably get to this 1.1-1.2 barg level with a boost controller, manual or not.
The main thing is to ensure that you have a pressure gauge to see waht levels of boost you get. if you hit 1.4 barg with the cats out, adjust yer boost controller. If you only get 1.1 barg. I would just leave it as it is.