Active Autowerke Underdrive Pulley Kit - E9X M3 (13-001)

Active Autowerke Underdrive Pulley Kit - E9X M3 (13-001)The Active Autowerke Underdrive Pulley Kit for the E9X M3 is a complete bolt on upgrade engineered specifically for BMW performance tuning. Constructed from aircraft grade billet 6061 hard coat anodized aluminum, this kit enhances the BMW S65 V8 engine's performance without compromising reliability. Engineered to release available horsepower by redesigning the crankshaft outer pulley Includes custom double sided A C drive belt (DPK) compatible with

The Active Autowerke Underdrive Pulley Kit for the E9X M3 is a complete bolt-on upgrade engineered specifically for BMW performance tuning. Constructed from aircraft-grade billet 6061 hard coat anodized aluminum, this kit enhances the BMW S65 V8 engine's performance without compromising reliability.

• Engineered to release available horsepower by redesigning the crankshaft outer pulley
• Includes custom double-sided A/C drive belt (DPK) compatible with late 2007 and later E9X M3 models
• Comes with an extra spare DPK belt for emergency use
• Maintains factory crank hex drive adapter and factory harmonic dampening characteristics
• Reduces rotational mass while preventing overheating issues common with smaller pulleys
• Designed for use with both DCT and manual transmission models
• All-inclusive kit with replacement drive and A/C belts ensures straightforward installation and full reversibility

Please verify your E9X M3's A/C belt configuration (single or double sided) when ordering this kit.