BMW M5 Underdrive Pulley Kit by Dinan — 13% underdrive, billet aluminum, black, for 2006–2010 M5 (S85). This lightweight crank pulley reduces accessory drag to free up power at high rpm.

Dinan’s pulley underdrives each accessory by 13% yet keeps the factory harmonic damper to help protect the crankshaft. On a stock car it shows gains of up to 6 hp and 4 lb‑ft at 8000 rpm. The kit includes the black anodized, engraved pulley, all mounting hardware, and shorter belts, and is backed by a 4‑year/50,000‑mile warranty.

Features

• 13% accessory underdrive to cut parasitic drag
• CNC‑machined billet aluminum; black anodized
• Retains factory harmonic damper
• Includes hardware and shorter belts
• Fitment: 2006–2010 BMW M5 (E60) S85

Questions or ready to schedule? Call our Austin, TX shop at 512-982-9393 or our Los Angeles, CA area location at 562-981-6800. We offer professional installation and customization at both locations.

Considering multiple items? Contact us for shipping discounts. We install on premises at both locations.

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