ok, try to be patient with me as this is my first wrx. i was a dsm guy for a few years and finally made the switch. That said, this is a whole new beast and i almost feel lost! i have a 2003 2.0 wrx. the car has a 3 inch cat back system and was tuned by the previous owner with the cobb stage 1 accessport and a turbo xs bov. Aside from that the car is stock. when i picked the car up (bought it from a friend) i noticed it was runnin a little rough, so i changed the plugs, had the injectors cleaned, changed oil and rear end fluid...the basic stuff. im noticing very inconsistent boost and vacuum levels on my guage, granted it is the stock column mounted boost guage but my fluctuations are noticable in the performance of the car. most days the car boosts to what would be the equivalent of 14 psi and vaccum holds steady around 12 however sometimes ill see a drop in power and notice my boost wont go above about 9-10psi even at WOT, vacuum isnt as stong at this point either. i have no issues with a rough idle or anything like that. also i hear an additional sound after the bov dumps, sounds like a high pitched whistle almost and only happens when my boost is below the norm. i dusted off my boost leak tester and have pressurized the car three times, no leaks. im not familiar with boost control solenoids and restrictor pills as all my dsms were simple setups (upgraded turbo, mbc, stuff like that) sorry its so long guys but i wanted to make sure you know what ive already tried and wanted to include my mods. i did check out the forums and couldnt find an exact answer, just looking for some direction. thanks guys!