Cold air intake?
#2
honestly ur best bet is to get a drop in k&n filter or those blue filters. and just stick with the stock airbox. It provides a sufficent amount of air to the powerplant. If u want to achieve more sound out of your turbo u can pull the airbox out and take out all the sounddeadening material and that will increase the noise level of the turbo.
#5
My advice
i just put the carbonio on my B6 1.8T and not saying that its a bad unit, but after i installed it i dont care for it. it does make allow you to hear your turbo spool up but the part that i dont like is that when you release off the gas you hear a noise thats verry simular to a BOV and to me it sounds like a Japanise car. so my next audi i wont do an intake. if you can try to find someone in your area that has one on a turbo audi/vw b4 u buy to see if u like it.