The system adapts to changing conditions, fuel quality, air filter resistance, temperature, barometric pressure to maintain AF ratios as perceived by the O2 sensors. Peak "boost" is managed by MAF where there is a mass air flow target and boost pressure is variable.
The down pipe may improve turbo spool-up, reducing lag. But peak power will only increase by secondary effects as reduced exhaust back pressure [and temperature from turbo will allow pistons to deliver more torque. To get significant increases in power you can get a stage II ECU mod if the rest of the exhaust system is lower restriction.
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