Would need to find out whats wrong with it first, if the primary turbo isn't boosting then I can't see how it would make any boost at all, also when lines are replaced, chances are the restrictor pills are now missing.
The system is the same as a B4 Liberty sold over here.
Ring service and ask to speak to the manager regarding work exp.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i