What's the performance difference between:
NST13710K Underdrive Crank Pulley + Alternator Pulley KIT (2pc kit)
(for naturally aspirated or turbo - shorter belt required)
AND
NST13748K CR-Lite Crank Pulley + Alternator Pulley KIT (2pc kit)
(for naturally aspirated or turbo or supercharged - oem belt)
???
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