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Underdrive pulley, no charging voltage at idle, not good for audio enthusiasts.
For every 1lb you take off ur crank is 2.7hp i gained an average of 22.5 hp off this pulley alone :) IT AWESOME!
Does lower the lights and A/C efficiency on idle but has a crisper throttle response and reduces constant shifting.
OBX Underdrive pulley from 2.0l Suzuki SX4, had to use a shorter belt. P/N 650k5
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obx raceing crank pully .