on what are you more interested in? As far as the vacuum lines, it is always important to zip-tie all vacuum lines so that there is no blow-off from excessive pressure. If you would have gone single turbo you would have gotten rid of most of those vacuum lines (just a bit of useless info!) But I would say the "usual" steps to stage III are the norm, followed by upgrading the intercoolers and possibly blow-off valves (vice the stock re-circ. valves) but some people don't believe in them....I do. I also have an AVC-R and most of our shop uses them. And remember never to be afraid to ask a question to us..better safe than sorry! :) Oh, and we don't bite!