Are you going divided? There have been tests done on the divided housings showing that the "smaller" .91 housing made just as much power as the one 1 size larger, yet improved the spool. That is why I got the .91. Then once I realised the housings are massive, and the number is a little deceiving, I understood why. I think there is a divided one in the .8x size range, I've been contemplating switching to that.
Lots of really good info here:
http://www.supraforums.com/forum/sho...-S300SX-turbos