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obviously i am talking about an s13 t25. other t25's with different sized housing's and core's will offer different results.
some skyline turbo's have a ceramic core and you cant take them much above 10psi.
i had s13's for about 3 years mate so i know a fair bit about them! 15psi is fine as long as you have supporting mods ect like fuel pump, different map ect.