i had to drive a customers sti to the alignment shop the other day and the lightest touch of the throttle resulted in a big PSHH from the wastegate and it drove me nuts driving it 10 min lol
You can fix that with the proper spring in the wastegate. My friend Matt has a nearly identical setup and can drive the car all day every day without ever causing the wastegate to open.
2005 WRXSTi , 2002 WRX, 2007 Impreza 2.5i, 1997 Impreza L coupe - All stock