Curious do you have a graph of the dyno plot? As well as if there was a vacuum leak it would certainly show itself, rough idle, loud hiss type noise associated with it. As well as just curous do you have any ems or safc installed? Could be in tuning itself, Another theory is the dyno reads low, ie: 10% as compared to other dynos that would put you up in the vacinity of 180 rwkws. Amount of piping doesnt really reflect on lack of boost either 8psi is about normal with no boost controller.
But if your concerened that there is a leak amongst the piping some soapy water and put it around the joints, look for bubbles.
Thats a start
Just a few theories
Cheers