totally possibe d00d.
But for a more technical explination, go over to the "Aftermarket Forced Induction" forum. That's where most of the RS, and other non-turbo models go for info on how to turbo their car's.
It'll most likely cost you a bit of cash to get your RS to 200Whp, but it's possible. Hell anything is possible, you just gotta have the cash.