Hi,
I'm on the verge of getting my credit card out for a full Milltek on my gti

,,, but I'm hesitating

The main reason is the noise. I've listened to some sound files for resonated units and they seem noisy. I'm sure many have had stock exhausts then upgraded to a resonated turbo back Milltek. Can someone please advise me on the following from 1st hand experience:
How much louder is a resonated system compared to a stock system from inside and outside of the car.
Is it quiet when just driving normally (does it turn heads)
Does it drone and will it get on your nerves on a long journey
Will the extra power increase be noticeable, if so, in what way (have revo)
Thanks