Which size t3/t4 should i get?

Hello everyone. Jut recently found out my turbo is bad. I have s2000 injectors begi fmu and a head spacer(around .040). I have a t3/t4 on the bike now. I am not sure what ratios i should go with i cannot find any markings on the turbo other than the manufacturers name. I would like to get a ball bearing turbo instead of a journal bearing. Ive heard they have faster spool and are typically better bearing designs. Thanks for the input.

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