Just thought of something else...
In my sound clip I just made, you can hear where the power starts to drop off. From launch to ~6k RPM, there is a strong sound to the engine/exhaust, but above that it actually becomes almost silent. Not like the sound goes away, but instead of a rasp or growl like what is heard through the rest of the clip, it's just like a loud white noise. Not sure if thats indicitive of anything. Give it a listen if you need clarification. Is that a symptom of some sort of breathing difficulty or timing "issue"?
http://www.subaru-svx.net/photos/user.php?SVX10
It's the file with the long, descriptive name