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The turbine on the G25-660 is only 85% the size of the EFR7163 and the compressor is 94% the size yet it flows the same. Efficiency is 79% vs 74% on the EFR. Hands down, Garrett's turbine/compressor aero is better. The only thing keeping the EFR competitive is the TiAl turbine material, if Garrett made a TiAl version of the G25-660 it'd be no contest.
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