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2002 Audi A4 (B6) 1.8L turbo

I heard a loud whoosh of air under the hood as the turbo would come on. I checked around for the location. It is coming from a 1/2" hole at the top of the intercooler, the hole is not a puncture, rather it looks to be a mounting point for a hose or something. Is this normal, am I missing a hose? My 2000 A4 never made this sound.
 
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