It is a smaller crankshaft drive pulley that drives all of the belt drive accessories at a slower speed. This takes less horse power to do, so there is that much more for driving the rear wheels.
FLAT 6 INNOVATIONS :: Engine Parts :: Under Drive Pulleys/ Harmonic Dampers
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2000S Ocean Blue Metallic- 116K
3X Water Pump, Clear side markers, Crios Mod, Front engine mount, Flywheel, clutch, RMS, AOS, MAF, serpentine belt, power brake vacuum line, battery, 2X CV boots, Fuel filter, Oil filler tube, 3X ignition switch, 90K service, gas cap
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