I used to have the Neuspeed P-Flo intake for my K03 audi TT. I found it to be very noisy as everyone else has said and got a decent amount of heatsoak when in stop start traffic.
ITG developed a intake kit for the TT on my car and now I can barely hear any intake noise. A little bit of suction noise under load but really minimal and that's it really. If I changed to the ITG from stock and took a friend out they wouldn't notice any different. It's down to the enclosed filter that they have done. Here is a pics.
Seems to be given massive torque figures and looks pretty meaty with a 5" bore!
I don't know whether there is a company out there that offer's an enclosed intake for the Golf specifically. This ITG kit wouldn't work due to the massive airbox and the lack of battery in the front of the TT. From previous knowledge I think Pipercross had an enclosed filter induction kit for VAG K03 fitment. Worth a look.