gt28rs w/ 64. for quickest spool but you'll run out of air quick. Im running a gt28rs w/ .86 and can hit 19bs around 4k rpm, but being that the compressor wheel is so small it is over spinning the wheel creating heat (ie killing power). I would get a gtx2867 or gt2871 if i had to do it again. The larger compressor can simply push a larger volume of air into the engine.
what turbo are u currently using?
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