Since your wastegate is still set for "Stock" setting... . then all your gonna see is 20psi tops. The wastegate is opening and dumping anything "Extra" you have.
On the manuals you change the elbow to trick the wastegate. On the 2001+ autos you gotta use a spring and or a turnbuckle to slow it down. . and some even disable it.
Do a search and you'll find some threads with the answer you need.