Rogue Engineering has developed a power pulley kit that reduces the drag on specific pulleys while allowing others to remain at their same efficiency. This allows for perfect operation in daily driven vehicles without a hiccup or stutter. However, when the demand for power is requested, the power pulley kit allows for the freed power to become apparent. The term "power" pulley is a bit of a misnomer. Underdrive pulleys actually free up power by reducing the drag caused by the accessories. These pulleys are based off a calculated percentage from factory dimensions, so that particular component speeds are safely reduced without affecting their true purpose.

Rogue Engineering Power Pullies are CNC machined from 6061-T6, heat treated aluminum and specially coated with a MIL-A-8625 Type III hard coat anodize finish. This kind of anodizing is not to be confused with a Type II cosmetic anodize finish (typical colors such as red, blue, silver, green, etc.). The hard coat anodize finish actually builds a small surface layer on top of the aluminum, preventing wear.

E9X M3 pulley kit is available for single sided power steering cars (2007-5/08) and double sided power steering cars (6/08 and on). If you have a 2008 M3, double check the LEFT side belt of your engine (when standing in front of the car). If you have a belt with a ribbed side and a smooth side, you have a single sided power steering belt.

This kit is for models with a production date of 05/2008 and newer with double belts. For single sided belt setup see ES3546881.