The holes might be to make the air flow a certain way into the turbo, not sure if youd want them out of the pipe though although im not a turbo specialist.
Vectra VXR estate 2007 Sapphire Black
Teapot Tuned 255/300
Eibachs B8's, fully loaded factory options
Tech2 & MDI diagnostics + SPS
I can't see the pictures at work but if you are referring to the part I suspect, they are part of the crank breather system and help maintain laminar air flow as the crank breaths into the intake through the pipe attached.
All of the intake track can be replaced but you will have to find simething to do with the breather pipe.
There is not likely to be any gain from changing all that pipework, as the inducer size is far smaller than the pipe diameters.
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