Decided I'm going probably going to go for a Milltek and seen the 2 types listed. I'm assuming one will be louder, which is which and how extreme are we talking?
might be worth a search, I posted this exact same question up a while ago, quite a few replies including some sound/video clips. failing that a search on youtube turned up a few anyway
the non res isn't much louder than the standard! I was quite supprised when i heard it! maybe diffrent when it is a turbo back rather than cat back tho!