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.
This Part Fits:
| Year |
Make |
Model |
Submodel |
| 2006-2010 |
BMW |
M5 |
Base |
| 2006-2010 |
BMW |
M6 |
Base |
