Airbox intake with hole in it

I recently decided to replace the arched airbox intake pipe on my Octavia mk2 VRS so I found one online and bought it. It seems to be the right and perfect fitting part but I noticed a strange difference, It is a 2013 part and my car is 2011. What I saw is a 2cm diameter hole in the intake just where it is dished in, where there is an arrow pointing to the centre of the dished area and I see there the hole whereas on my existing intake pipe there is no hole, just circular markings where the hole would be with the raised arrow pointing to it. Very strange difference I have not seen documented.

I'm sure experts here will know what it is. Is it perhaps a place where another pipe can be adjoined via a grommet push fitting to put refrigerated air into the intake? Is it simply to increase the intake capacity. As the air rushes through that area, does the dished in section speed up the air or turbulate it?

Any ideas? Please share your theories or knowledge!

Rich

VRS mk2 2.0 TDI