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The gt28rs will perform a little better and spool a little faster than the ct20b. I'm not aware of any ct20b that will spool faster than 2900. Both are capable 300whp turbo's on a gen3. The gt28rs would probably make 330whp with the right mods and fuel. The ct20b suffers from shaft flex, and as pointed out has (mostly) a ceramic turbine.
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