Recently the boost in my golf has been a bit up and down. some times when i drive it boost will sit at 15psi, then others it will hardly get to 12psi. This varies from day to day.

At first i thought it may be a boost leak, but now i am not so sure as its not down all the time. Is there a sensor i should be checking out, or somthing else.

Im at the point where im going to take all the piping off beween the turbo and the intake manifold to check for cracks.

This is really starting to annoy me. Any suggestions on what it could be?