There are threads in other forums comparing the two turbos with specific number and data on spool time and power output. I'll add the links when I get home tomorrow, in both instances the EFR outperformed the gtx
I believe they tested 3 different versions on the EFR against it's counterparts.
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E92 M3 19" wheels for sale///JWT Cams and Springs +30whp for sale... cheap.
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