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Remember a bigger turbo also flows more air at same pressure as a smaller one.
I don't see why BMW wouldn't have simply increased flow in direct proportion to target rating. The new turbo's efficiency range should allow a corresponding percentage increase in max power. The practical max HP on 93oct is going to be a little less than halfway between the max for the 335i turbo and max for the M4/M3 turbo. I figure 400-420 max.
335i 280whp stock, 360whp max 93 oct
M2 330-340whp stock, 410whp max 93 oct.
M4 430whp stock, 480whp max 93 oct avg jb4 map1&2 beta
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