Well, although not a big restriction, I would suggest doing the intake silencer delete. Search on here or NASIOC and you will find writeups on how to do that.
Go grab a K&N drop in filter too.
Seeing as you plan on doing something today there's not much else you can do. There's not many restrictions in the stock intake system. But I would suggest buying a new turbo inlet pipe. The accordion style stock one sucks (no pun intended) and a good one from Perrin or APS will do a nice job of smoothing out the airflow before the turbo.
all good stuff that won't break your car and will make the intake sound a lot louder.
As for performance gains from that stuff... just don't expect anything and you won't be disappointed lets put it that way.
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