If you have a boost gauge, that'll tell you for sure. If you can make full boost, you probably don't have a boost leak. If you can't, check the intercooler connections first. Don't romp on it more than you have to in order to determine if there is a problem and where it might be.
By the way, a boost leak problem will drive pretty normally when less than 0 psi (i.e. half throttle or less) and won't be readily apparent until you try to make boost. Then depending on the size of your leak, you will make between 0 and full boost (~18 psi @ stage 2ish).
Last edited by Dujo; 10-07-2012 at 05:53 PM..