Bundle and save big time!!!  

77mm supercharger pulley tune upgrade offers excellent drivability and does not adversely driavability or MPG or boost level and supercharger RPM. 

Kit includes a  flash tune cable and customized for your current modifications. 

Ultimate Performance supercharger pulley upgrade for the AMG 55 Kompressor motor.  Our tests show 65 + 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. 

Great replacement power SC pulley for the OEM units that fail, for 1/3 the price!

Fits 2003 - 2007 AMG Mercedes 55K Models

The patented and original Ultimate Performance supercharger pulley upgrade for the AMG 55 Kompressor motor.  Our tests show 50 plus 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. 

Specs:

Increases horsepower and torque

35% lighter than factory pulley, reducing rotational mass

Reduced rotational mass increases supercharger longevity

83 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: 3lbs (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 offshore)