are boost controlers safe to use? would you not have to raise fuel pressure too? talking about for a wrx with standard ecu.

 

What year is it, and is it an import.
Boost controllers are fine if you have the correct monitoring on the car, as you over ride the safety built in to the ecu.
Knock sensor, EGT, lambda link.
Raising the fuel pressure will give you the extra fuel, but you will need to know how much air is also being consumed.

 

Best and safest method is EBC and remap...get both setup together - cant go wrong then.