The larger impact of having a boost leak is that the air that is escaping out the leak has already been metered by the airflow sensor and it dosent go into the engine. The airflow meter registers this flow and adjusts injector pulse width accordingly. If less air goes into the engine then what is metered it will run stupid rich and have very little power. Some times its hard to audibly hear a boost leak, but if you have an air compressor and a boost leak tester you can check to see if your intercooler piping is leaking.