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But what's it do?

These replace the standard turbo inlet part which is supposedly a flow restriction due to the noise restricting design.
I've seen plenty of vid reviews where people notice little to some noise increase, no-one really commits to saying it makes any difference to performance.
Seems similar to the inlet flapper delete mod to me, good in theory but arguably of little value in practice.
 
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Thats the MK3 version,

As a stand alone item i dont think you will notice any difference on the car (maybe a little bit more noise) but certainly on the MK3 this is one of the mods you do to get the smoothest, uninterupted flow of air into and out of the turbo thus giving max power from your stage 1/2/3 map.

As you have already mapped the car I would talk to guys who did the map and ask them if this will work well with your car setup.