(AustinsCE "So, what about a Twin/Bi turbo setup? Any research into that? Or just whats already available?")
I have actually found a company that has this setup.
For the kit: About $5,500. For a fitted kit: About $6,500. (these are direct bolt on appilcations I've been told)
One reason for the difference in price is I think one is done by turbo mapping but I'm not sure. There is a pretty nice increase in performance, but if you get just one turbo that will handle the job, it will be cheaper than buying two. Unless you wanna open that hood and make somebody's jaw drop saying: "Twin Turbo

"
Either way, you'll be happy. You just want to find out if it's worth the $ for the twin or single. Again overall what matters is what kind of turbo and how much power can it produce, because the t3/t4 hybrid itself is capable of 400hp!! Thank you, benzito190 for the kit!

Like I have said, just make sure your car will be capable of taking the boost if you decide to go with better and bigger turbo(s).
Have fun! Let me know how your project goes!
Here's the site:
http://www.tdi-plc.com/Merc190class.html
They also have a traction control available!!
They are quite spendy but it's cheaper than Flying tigers kit which is over 12k!!
For anyone looking for a cold air intake here's a site:
http://wade************************/