Piping size without intercooler

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Hi,

I'm working on a sohc 4g63 turbo, I need ideas about piping size for setup without intercooler.
GT25 turbo, DIY methanol injection, about 8.3:1 compression ratio, 2.5'' downpipe and exhaust, 7~8 psi boost, NO INTERCOOLER and about 200 to 230 whp on pump gas.
Ideas?

 

[Canadian_CD9A]

2.25" absolute max, that's not a high-flowing setup. I'd probably go 2.0".

 

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TNX.