Dinan Underdrive Crankshaft Pulley Kit | E60 M5 · E63 · E64 M6 | 5.0L V10 [S85]

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Dinan Underdrive Crankshaft Pulley Kit | E60 M5 · E63 · E64 M6 | 5.0L V10 [S85]Dinan's lightweight billet aluminum crankshaft pulley underdrives each of the accessories by 13 percent, reducing parasitic drag on the engine for a 6 HP @ 8000 RPM and 4 lb ft torque @ 8000 RPM gain on a stock vehicle. The Dinan underdrive pulley retains the factory harmonic crankshaft damper, eliminating vibration that might otherwise damage the crankshaft. The kit includes all of the necessary mounting hardware, lightweight pulley, and shorter

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