Originally Posted by
ttboost
As has been said...it will be a tough and expensive road... and you "likely" won't hit your goal, whatever that may be. Along with turbos, you need intercoolers and piping, all of which is an engineering marvel/nightmare in this car. Most of "us" that have started this "project", bailed because "we" determined that it will be a tremendous amount of time and money (lost time and money, if you care about that) to dump into a 15yr old car, and realized there are better and easier cars to mod, with greater results.
My tuned 6sp RS6 made ~480awhp and ~560awtq, with stock turbos, and could "only" muster a 4.2-4.0 0-60 on it's best day. My 2013 S8 runs consistent 3.5's bone stock. Understandably, a huge price comparison with regard to price of entry, but at the end of the day, I determined I would rather spend the money here than there.
Good luck on your travels. With enough time and money, you can do anything. "we" chose not to.