As emp? has said, boost at 1 bar and trying to get 250rwkw on a 1G isn't ideally achieveable. Sure it can be done, but how much are you willing to spend? It would be an expensive excersise.
And 250rwkw on a 1G will be pretty laggy no matter which way you look at it.
My advice would be to go for a GT3071R with a 0.48 rear housing, run it at 15psi and be happy with what you have.
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