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IC is more commonly known as the Intercooler.It's possible that it's either full of
valve is also a very common problem as said before.
I'd also check the boost side hoses for splits,check the airflow meter/air filter,and also all the vaccuum hoses and boost control solenoid connections and boost pressure sensor connections.
Currently in Lagdti's garage:
2004 Saab 9-5 HOT Aero and a 2001 Audi A3 1.8 Turbo