I know there are a few hoses that you can't see, you're going to have to get up under there. I know my stock hoses are getting close to cracking, and I'm just going to replace them with Hard piping instead. You're boost stock should be around 6.8psi, maybe a little higher on a JDM motor. I don't know since mine isn't hooked up yet, but all I need is a gauge and lines.
Also check the points of connection, maybe something isn't sealing right. Good luck