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check your vaccuum lines / intercooler piping. make sure everything is connected properly and fastened.
with vaccuum lines, the easiest way to search for a leak is mix up water with a bit of soap. pour a bit onto your lines (while the car is running), and if you see a bubble, theres a leak, and replace the line.
or your waste gate sucks.
If he's getting zero boost I highly doubt it's a vacuum line