Unleash hidden performance with the Macht Schnell Performance Underdrive Pulleys, engineered exclusively for the BMW E9X M3, E60 M5, and E63 M6. Crafted from aerospace-grade 6061-T6 aluminum and T3 hard-anodized for superior strength and corrosion resistance, this DualDrive pulley system reduces parasitic drag by slowing down accessory rotation—resulting in a free gain of horsepower and torque without compromising factory reliability. Expect up to 18–20 HP and 16–20 lb-ft of torque gain on M5/M6 models and 9–14 HP and 7–9 lb-ft on the M3, all while maintaining OEM cooling and alternator performance.
This bolt-on upgrade preserves factory crank harmonics and balancing, and includes new belts for a seamless install. Perfect for street or track use, the Macht Schnell Underdrive Pulleys enhance throttle response, extend accessory lifespan, and deliver dependable performance with every press of the pedal. If you’re seeking a proven, no-compromise power boost for your M car, this is the upgrade BMW enthusiasts trust.
Macht Schnell Performance Underdrive Pulleys have no negative effect on the accessory operation and come fully equipped with new belts.
Performance Underdrive Pulleys Features:
- DualDrive design allows maximum performance, with minor effect on accessory speedÂ
- Proper cooling temperatures are retained at appropriate levels on or off the track - Maintains proper alternator speed, allowing sustained levels to sensitive control modulesÂ
- Machined from 6061-T6 aerospace aluminumÂ
- T3 Hard-Anodized for maximum strength and corrosion/wear resistanceÂ
- No effects on crankshaft dampening or harmonics - Simple bolt-on installation
Models Supported:
- 2008+ E9X M3
- 2006-2010 E60 M5
- 2006-2010 E63 M6
NOTE FOR E9X M3: If your power steering belt is double-sided, please select 06/08+