You've popped a boost hose somewhere. Happened me when got our V70 in September. It turned out to be the top hose where it enters the intercooler but check all of yours. You may not have tightened one of yours correctly so just inspect them again.
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Liam...
'96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.
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