is it worth putting a blow off valve on a vw passat?

I bought my wife a 04 VW Passat and now she wants a blow off valve, can it be done and is it a good idea?
 
make sure you install the blow off valve BEFORE the air metering sensor. otherwise the pcm thinks its getting air that is not actually there. could really screw things up. and she really wants that annoying sound? is that thing even turbo??
 
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