If it runs over 2 bar of boost on.a 3 bar map sensor then the ecu cannot see the boost over 2 bar to use any form of protection.

All the ecu knows is that it's at it maximum.

Aftermarket ecus have the required scaling and break points to use a 5 bsr sensor which is far more ideal, but the webers are not very nice on the 5 bar map sensor.

I use the turbosmart controllers quite a lot and as long as they are mapped on them they work very well and do have over boost protection built In.