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It's probably worth a call to find out. I checked their catalog and it lists their 2.3L crank as 2.9kg lighter than the Ranger unit, which is almost a 20% reduction. Interestingly their 2.0L crank is only marginally lighter than stock (13.3kg vs 13.5kg).
According to [email protected], the crank allows for higher rpm. I don't think the stock head can handle much more than 7500 or so RPM (springs etc?), so it would be a waste apart from quicker blip response times due to the lower mass. For what it's worth, I run a Exedy flywheel/clutch pack that is heavier(!) than stock, and have no problems with blips. One day I'll go aluminum flywheel and forged crank, but that is after the roll cage is in
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