I have one in a MKIII, Spyder,and have had it for nearly 6 years, around 60,000 miles,. 320 RWHP 220 RWTQ. Only problem I had was I have blown off a couple of boost hoses. Stock internals, A/W intercooler, PFC for the ECU. There are half a dozen 2zz' Spyders with a Rotrex in the States, mine was the first, or at least the first I heard about.
Here is a link to the guy who developed it that made a kit, but discontinued it due to lack of interest.
http://spyderchat.com/forums/showthr...Rotrex+article
There are more articles there, I'll look for the one on my install but I never bookmarked it. The search function there is rather poor.