Yep, get full system noise is spot on not to loud but loud enough sounds the dogs when you boot it, the note will change slightly once you have bedded it in,
I had phase 2 done at the same time as having the full system so hard to tell initially on the performance, but I did have to put my old system back on for a week and the difference was crazy throttle response was dull and it was so restricted at the top end of the rev range it was cr$p, I would go as far as to say it is a definite mod if you are looking to get the most out of your car you wont be disappointed, It's not a cheapest mod but if you get the best quality equipment you can always tell.