some wheel sizes would help (there are a lot of T04 variants). if you want it earlier than 5000rpm, the .84 or .9x would work well (if the T04 has a .9x rear housing)
18psi is 18psi (measured at the plenum) - a genuine turbo probably won't make a whole lot more power (unless the e-bay special was particularly hotter, increasing your inlet temps)
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