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A properly tuned stock ECU should never, ever over-boost, regardless of the boost-controller settings! It has a fail-safe to prevent this. In fact, it has REDUNDANT fail-safes to prevent this! The ECU performs a safety check every engine cycle to determine if it should go into 'boost-cut' mode, where it cuts fuel entirely for an amount of time. This immediately (i.e. within one engine cycle) cuts engine output and stops the over-boost condition.
Unfortunately many aftermarket ECU tunes disable this feature instead of properly re-calibrating it for higher boost levels. With no boost-cut limit, and when boost-control is compromised, the turbos are free to push hotter and hotter air at ever increasing pressure, potentially leading to catastrophic engine failure from detonation and/or pre-ignition.
With a properly calibrated boost-cut limit, the ECU will simply stop engine output the moment things start to go wrong, preventing the over-boost from happening in the first place. This is a great safety feature and IMO it's foolish to disable it.
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