Dinan D560-0004 Underdrive Pulley Kit for BMW M3

The Dinan D560-0004 Underdrive Pulley Kit is engineered to reduce parasitic drag on the engine while improving throttle response and freeing up horsepower for 2008-2013 BMW M3 models equipped with the S65 V8 engine. By strategically underdriving the accessory components, this kit allows the engine to operate more efficiently under load.

Key Features:

• Lightweight billet aluminum crankshaft pulley with black anodized finish and laser-engraved Dinan logo
• Reduces water pump and alternator speeds by 16% to decrease rotational mass and drag
• Underdrives AC compressor and power steering pump by 19% for additional power gains
• Includes precision-sized shorter replacement belts for proper fitment
• Direct bolt-on installation with no permanent modifications required
• Maintains adequate cooling and charging system performance under normal driving conditions

This complete kit provides a measurable improvement in engine performance by reducing the power required to spin accessories, effectively freeing up horsepower that would otherwise be lost to parasitic drag. The high-quality billet aluminum construction ensures durability while keeping weight to a minimum. All necessary components for installation are included.