Dinan Underdrive Pulley Kit - 2008-2013 BMW M3 | D560-0004

The Dinan Underdrive Pulley Kit (D560-0004) is a power-enhancing upgrade for the 2008-2013 BMW M3 (double-sided power steering & AC belt production from June 2008 onward). This kit is designed to increase engine output by reducing parasitic drag on the engine from spinning the alternator, water pump, and AC compressor.

This is accomplished by precisely slowing down the speed of these accessory drives. The lightweight billet aluminum crankshaft pulley underdrives the water pump and alternator by 16% and the AC and power steering by 19%. This results in a verified power gain of 11 horsepower and 7 lb-ft of torque at 8400 RPM on a stock vehicle. Crucially, the Dinan underdrive pulley does not modify the harmonic damper, which can be harmful to the engine, and is made of aircraft quality 6061 alloy.

Features:

• Verifiable Power Gains: Delivers an increase of 11 HP and 7 lb-ft of torque at 8400 RPM on a stock vehicle.

• Reduced Parasitic Drag: Accessories are underdriven by up to 19% (water pump and alternator by 16%; AC and power steering by 19%) to decrease drag on the engine.

• Crankshaft Protection: Made of aircraft quality 6061 alloy and does not modify the factory harmonic damper.

• Structural Quality: Lightweight billet aluminum crankshaft pulley, which is black anodized and engraved.

Product Contains:

• (1) Lightweight Billet Aluminum Crankshaft Pulley

• (1) Set of Shorter Belts

• (1) Set of Mounting Hardware

Important Note: This specific kit (D560-0004) is for 2008-2013 models with a production date from June 2008 onward (double-sided power steering & AC belt). The D560-0003 kit is required for earlier models.

Warranty This product is backed by Dinan's industry-leading 4-year/50,000-mile factory matching new car warranty. Note: Manufacturer warranty terms are subject to change.