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With an ECU flash or tune, the boost can be increased along with other parameters that ensure a "safe" increase in boost pressure along with the appropriate A/F ratios (Air Fuel)
There are many articles that discuss manual vs electronic boost controllers, in most cases electronic boost controllers are used to accurately regulate increased boost in conjunction with a flash or tune.
Manual boost controllers put into modern turbo charged cars will just cause the ECU to retard timing and potentially identify a boost leak or throw error codes.
Hope this helps.