sti ej257 shortblock with ej251/2 heads?

[4doors4hp]

Hey all,
I own a 00 BH LGT wagon, I acquired a ej257 b25c sti motor. I know you can bolt up the heads to the block.
But what crossmember should i use?
many say use an sti one, but i feel like it will not fit an a legacy bay.
also what parts do i all need for forced induction? here is my list currently.
uppipe
downpipe
BOV
Intercooler
fuel rail
injectors
walboro 255 fuel pump
sti water pumper
sti oil pan
Tune

[GTDrifter]

Turbo crossmember or cut the stock one for the up pipe to fit. Oil and coolant lines for the turbo, maybe a stronger trans depending on how much power you plan to put down

[4doors4hp]

Turbo crossmember or cut the stock one for the up pipe to fit. Oil and coolant lines for the turbo, maybe a stronger trans depending on how much power you plan to put down

looking at staying around 300. i dont want to go too crazy. i know the 5 speed cant handle much over 350whp.