77MM Fixed Supercharger Pulley For Mercedes AMG (2003-2008) E55 CLS55 SL55 S55 G55 CL55

The M113K engine is a legend for a reason, but we all know the factory IHI supercharger runs out of breath at the top end. Stop letting modern turbo cars walk away from you on the highway. This pulley upgrade puts the "Kompressor" back in charge, delivering the instant torque and sustained boost that this V8 was built to handle.

77mm Supercharger Pulley Upgrade for Mercedes-Benz AMG 55K (M113K)

If you drive an AMG 55K, you know the chassis is heavy, but the engine is bulletproof. The factory pulley setup was designed for conservative boost levels and quiet operation, not maximum attack. This 77mm pulley upgrade changes the drive ratio of your supercharger, spinning the blower faster to generate significantly more boost pressure earlier in the RPM band. We aren't talking about a subtle bump here; our testing shows gains of over 70 rear-wheel horsepower and torque. That is the difference between keeping up with traffic and dominating it.

Beyond just raw boost, this unit is engineered to solve the common headaches associated with pulley swaps. It is 35% lighter than the massive factory steel anchor, which drastically reduces rotational mass. Less mass on the crank means faster throttle response and less parasitic drag on the engine, helping to extend the life of your supercharger bearings. The reduction in rotational inertia allows the engine to rev more freely, giving your heavy AMG a much more responsive, agile feel.

Grip is just as important as spin. Slippage causes heat and lost power. This unit features a specialized coating designed specifically to reduce belt slip under hard acceleration. Furthermore, it retains a refined engagement mechanism with an improved nitride-coated clutch, plate, and spring design. This ensures that while you get race-car performance, you maintain the driveability and reliability required for a daily driver. You get the power without the headache.

Why You Need This Upgrade

• Massive Power Gains: Proven to deliver 70+ rear wheel HP and torque, transforming the acceleration of the M113K platform.
• Reduced Rotational Mass: Weighs 35% less than the OEM pulley, reducing parasitic loss and improving throttle response.
• Engineered for Longevity: Lower mass means less stress on supercharger bearings and the crank snout.
• No-Slip Grip: Special surface coating prevents belt slip, ensuring consistent boost pressure during wide-open throttle pulls.
• Refined Engagement: Features an improved nitride-coated clutch, plate, and spring design for smooth operation without the clunky engagement found in cheaper kits.
• Daily Driver Safe: Designed to maintain a safe level of boost and supercharger RPMs for reliable street use.

Installation Notes

This pulley is designed for a straightforward installation, replacing the factory unit directly. While the hardware is "easy to install" mechanically, please note that changing the supercharger drive ratio increases boost pressure significantly. To ensure engine safety and optimal performance, an ECU tune specific to this pulley size is highly recommended to manage fueling and timing. Additionally, ensure your cooling system (intercooler pump and heat exchanger) is in top condition to manage the extra heat generated by the increased boost.

Replaces These OEM Applications

• 2003-2006 Mercedes-Benz E55 AMG (W211)
• 2006 Mercedes-Benz CLS55 AMG (W219)
• 2003-2008 Mercedes-Benz SL55 AMG (R230)
• 2003-2006 Mercedes-Benz S55 AMG (W220)
• 2003-2006 Mercedes-Benz CL55 AMG (W215)
• 2005-2011 Mercedes-Benz G55 AMG (W463)

Don't let your AMG feel its age. Install this 77mm pulley upgrade today and experience the torque the M113K was always meant to have.