I have a 2003 Subaru WRX and my stock turbo doesn't spool every time I drive it or "need" it. Sometimes the turbo will kick in at about 3500 rpms and other times it doesn't do anything, and even when it's idling. I know this because I can obviously hear the blow off valve when it does spool. Any idea what it could be? I am pretty new to these cars so I don't know much. The other thing is that the clutch is about to go out and I will be getting replaced very soon. When I get the car going and the boost does actually kick in, I lose the clutch at about 4500-5500 rpms usually because it can't hold the extra power. Could it be something to do with that? Maybe some sort of safety switch by an internal computer keeping the turbo from spooling because of the lost in power with that worn down clutch..?? I am not sure. Please help me out!