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Paul,
I am curious as to why you think the turbo got much "laggier" when looking at the japan gas dyno vs. 91 octane dyno.
I know you were able to be more aggressive with japan gas but does it really make that big of a difference in the low rpms? 1000 rpm difference in spool time? Usually when switching to higher octane I see big increases in the top end, not the bottom end.
For a street kit like this I would almost say it would be better to size a smaller turbo for us here in the US. One that spools at 3k rpms not 4k rpms.
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