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400 wheel is pretty ambitious on pump gas with a bottom mount turbo.
To make big numbers on pump gas you need cool-ish air coming out of the turbo with big boost and as little backpressure as possible. 93 octane will be knock limited, and a stock t25 frame turbo with a small exhaust housing will create backpressure and raise EGTs, even something as modern as a g25.
A t3 twin scroll top mount gtx3071 is probably the best option for making 400 wheel with relatively good response, a turbine housing that won't restrict the motor and a manifold that will spool the turbo.
If you lower your power goal to 350 the 2867 on a stock manifold would be an excellent option, or if you run some better fuel that same turbo will make 400+ easily. Take it from someone with a flex fuel bottom mount SR. Mine makes 330 on pump and 410 on e70 ish. This is all with a gtx2860 gen 2.
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