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What the hell car is it? Only N/T DSMs are 9:1 stock.
The ammount of boost you can safely run is a facter of many things:
Fuel volume available
Fuel pump strength (can it push the pressure required for the boost)
Tuning capability to safely tune for the boost
Strength of the pistons/rods
and much much more
If you think boost doesn't mean anything then I hope you're not tuning anything. Boost creates cylinder pressure which is a direct load on the motor. CFM/airflow is NOT load. CFM makes power not load.