Ah that would make sense, also sorry ive been without internet for a while. So from what i see it obviously doesnt improve performance, just increases noise? Doesnt seem to much worth it. Sounds like its one of those cases for it to be beneficial id need a Tune yes?
Your turbocharger and the excellent stock CAI intake system can supply more than enough air for your TDI unless you make some serious modifications to the engine (like a bigger turbo and injectors). Of course, this kind of power would be very expensive and require a custom tune. Assuming that you want to keep the stock turbo and fuel system, no hardware changes are necessary.
As for a tune itself, it is definitely the biggest "bang for the buck" power modification for your engine if power is your only goal. However, just about any tune will change (and probably harm) your emissions and void your engine's warranty. Therefore, these are probably also technically illegal not to mention morally questionable. The choice is yours. How much power do you need (want?) and what cost are you willing to pay for it?
When it comes to car modifications, my motto is "learn first and spend money second". There are a lot of people selling "upgrades" that aren't worth the money unless your only goal is looks. For example, I would only modify the intake if I had good reason to believe that engine would benefit from getting more air. First things first.
Have Fun!
Don