I've been researching this topic extensively as well.
It seems that our tiny turbos would benefit from this greatly considering an aftermarket intake neglects gains due to the increase in temperature. This would reduce temps AND create denser air.
From reading as much as I could find, there have been a few folks with damaged turbo vanes, could be for a variety of reasons, including percentage of meth to the injection not atomizing properly before the inlet, or maybe even leaks.
I'm probably going this route, with the smallest nozzle possible, highest pressure possible, and 100% water. (here's a good review on temp vs water/meth ratio and nozzles:
http://www.dsmtuners.com/threads/pre-compressor-injection-test-results.363191)
They sell a kit made for the K03 turbo(inlet size approx 1.5 inches), but its a bit overpriced IMO for a nozzle holder, nozzle, and lines.
http://www.usrallyteam.com/index.php?main_page=product_info&products_id=1943
Anyone know what our turbo inlet size is?