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there's more to performance than displacement.
a two-liter six will spool a turbo faster than a two-liter four- three exhaust pulses per revolution instead of two-
there's probably more to it than that, and i am not an engineer, but it seems pretty telling that the RB20DET used a T3 for its entire lifespan in the R31 and R32, while a T25 or T28 has always been "enough" for the SR20...
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1991 240sx coupe
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