Red Special edition 77m Ultimate Performance supercharger pulley upgrade for the AMG 55 Kompressor motor. Our tests show 70+ rear wheel hp and torque gains, while maintaining a safe level of boost and supercharger rpm. Pulley upgrade offers excellent driveability and does not adversely affect highway mileage.

Fits 2003 - 2007 AMG Mercedes 55K Models. The patented and original Ultimate Performance supercharger pulley upgrade for the AMG 55 Kompressor motor.

Specs:

• Increases horsepower and torque
• 35% lighter than factory pulley, reducing rotational mass
• Reduced rotational mass increases supercharger longevity
• 77 mm diameter
• Easy to install
• Special coating reduces belt slip
• Improved nitride coated clutch, plate and spring design
• 77 mm in size up to 3+ psi increase with tune (as compared to a stock supercharger pulley)

Weight:

2.5lbs (one pound less than stock 3.5) ~28.5% reduction in weight
Equates to 180mm crank pulley in power but much less rotating mass!

Made in USA by UPD (not offhsore)