I just installed my greddy profec type-s boost controller and I was trying to mess around with my boost. This is when i realized my car wont hold anything more than 5psi, even without the boost controller my car would hit 6, then go back down to 5. Sometimes with the boost controller it will spike at about 9 or 10 then go back down to 5 or 6. I was thinking boost leak(s) but then i read something on a dsm forum about turbos with a small amount of shaft play(which i have) having air escape through the oil lines and then escaping through the breathers in the valve covers. I doubt this is whats wrong with my car, but it got me thinking. What are some reasons this could be happening?