Thanks. If you can pull together peak boost and timing at peak boost, those numbers could help too. Also, I wouldn't say you 'need' a catback for any turbo. I'm on the stock CBE on a BNR68 with e85, and my car is great. I know I'm leaving some on the table, but it is quick enough, and I haven't been able to find a wife-approved CBE.
If you're going to continue scenarios on the stock block and 93 up to 400, I would be interested to see where meth is required.