How high did you leak test up to?

I have always recommend that people do leak test. Every oil change I make sure I do a leak test. Right now my car is boost leak tested up to 25psi. Once you get passed about 15psi you find that your stock TB will leak bad.

Something else to consider also, do you have a check valve installed on the car? If not your stock pcv valve will leak under almost 3-5psi and stays open. The check valve will allow you stop that leak.