HAVE TO REGISTER!!!!! If you're looking for answers to questions then the american MR2 forum is the best place to get the answers! So it's definately a good idea to register as, at the moment they are light years ahead with their MR2 tuning.
Interesting thread, but I think it's proved to me that the bigger 0.86 housing might be the best, as this turbo with the smaller housing seems to die off by 6k, despite spooling up so early.