you guys are giving answers to a question he did not ask
1) Raising the boost WITHOUT re-tuning (dealing with the ECU) is ALWAYS bad, no matter what kind of boost controller you use (MBC, EBC, whatever).
2) Yes, you can adjust the boost simply through re-flashing the ECU. This is the BEST way to do it because it's easy to adjust other parameters while you're in there as well to compensate.
3) IF IF IF you already have a means of tuning and want to replace the stock solenoid, than an EBC can do wonders at helping you maintain a more consistent boost. This of course requires you already have tuned the thing to use it.
The fist engine mod you do is the ECU and every other engine mod you do should be accompanied by ECU adjustments as need AS WELL.
2015 STi: Still Stock
04 STi, 04 WRX: SOLD