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I noticed from scanning it, the rpms jump by 500 when I flip it from low boost to high boost (5 psi to 11 psi). That's when I'm already turning about 5k.
I'm going to try my 4K, but when my tranny goes I plan on doing a th400 swap and will prob lower it to 3K or 3500.
I don't think that 4k stall will be that fun and flash really high but worth the try I guess if its already in there. Depends on when the turbo spools too, if its somewhat bigger than it might not be TOO bad. 3500 would be allot better but 3k seems do be the norm.