Macht Schnell Performance Underdrive Pulleys for BMW E9X M3 - billet aluminum crankshaft pulley set
Macht Schnell Underdrive Pulley Kit E9X M3 components - crank, alternator, and AC pulleys
Macht Schnell Underdrive Pulleys installed on BMW E9X M3 S65 V8 front accessory drive
Macht Schnell Underdrive Pulley size comparison vs factory E9X M3 S65 OEM pulley
Macht Schnell Performance Underdrive Pulleys hardware and installation guide - E9X M3

Macht Schnell Performance Underdrive Pulleys - BMW E9X M3 / E60 M5 / E63 M6

$349.00

SKU: 10.00.01X
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The factory accessory drive on the BMW E9X M3, E60 M5, and E63 M6 runs the alternator, power steering, and water pump at engine speed — spinning them harder than necessary and consuming horsepower from the S65 or S85 in the process. The Macht Schnell Performance Underdrive Pulleys use a DualDrive design to slow accessory rotation relative to crank speed, recovering that parasitic drag as usable wheel horsepower and torque.

CNC-machined from 6061-T6 aerospace aluminum and T3 hard-anodized, these pulleys deliver 9–14 hp / 7–9 lb-ft on the E9X M3 and 18–20 hp / 16–20 lb-ft on M5/M6 models with zero impact on crank harmonics or balancing. Cooling and alternator output remain within factory spec at all operating conditions. New belts are included for a complete bolt-on installation. E9X M3 note: select the 06/08+ variant if your power steering belt is double-sided.

Brand: Macht Schnell
Fitment: BMW E9X M3 (2008+), E60 M5 (2006–2010), E63 M6 (2006–2010)
Engine: S65B40 (M3), S85B50 (M5/M6)
Material: 6061-T6 aerospace aluminum, T3 hard-anodized
Design: DualDrive — reduces accessory rotation relative to crank speed
Power gain (M3): 9–14 hp / 7–9 lb-ft torque
Power gain (M5/M6): 18–20 hp / 16–20 lb-ft torque
Cooling and alternator output: Within factory spec
Crank harmonics: Unaffected
Includes: New drive belts

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The factory accessory drive on the BMW E9X M3, E60 M5, and E63 M6 runs the alternator, power steering, and water pump at engine speed — spinning them harder than necessary and consuming horsepower from the S65 or S85 in the process. The Macht Schnell Performance Underdrive Pulleys use a DualDrive design to slow accessory rotation relative to crank speed, recovering that parasitic drag as usable wheel horsepower and torque.

CNC-machined from 6061-T6 aerospace aluminum and T3 hard-anodized, these pulleys deliver 9–14 hp / 7–9 lb-ft on the E9X M3 and 18–20 hp / 16–20 lb-ft on M5/M6 models with zero impact on crank harmonics or balancing. Cooling and alternator output remain within factory spec at all operating conditions. New belts are included for a complete bolt-on installation. E9X M3 note: select the 06/08+ variant if your power steering belt is double-sided.

Brand: Macht Schnell
Fitment: BMW E9X M3 (2008+), E60 M5 (2006–2010), E63 M6 (2006–2010)
Engine: S65B40 (M3), S85B50 (M5/M6)
Material: 6061-T6 aerospace aluminum, T3 hard-anodized
Design: DualDrive — reduces accessory rotation relative to crank speed
Power gain (M3): 9–14 hp / 7–9 lb-ft torque
Power gain (M5/M6): 18–20 hp / 16–20 lb-ft torque
Cooling and alternator output: Within factory spec
Crank harmonics: Unaffected
Includes: New drive belts