Upgraded 72mm Supercharger Pulley for Mercedes Benz C-Class SLK-Class C32 SLK32 Chrysler Crossfire SRT6 (2002-2008) 3.2L

High-Response 72mm Clutched Supercharger Pulley for 2002-2008 Mercedes Benz C-Class,SLK-Class (W203/R170)

What it Does: The 72mm Clutched Supercharger Pulley replaces the failure-prone factory clutched pulley on the 2002-2008 Mercedes Benz C-Class and SLK-Class to reduce rotational inertia, eliminate clutch slippage, and sharpen boost delivery without requiring an ECU retune.

The Stock Mercedes Benz C-Class,SLK-Class Supercharger Pulley Weakness

The factory clutched pulley on the supercharged M112K engine relies on conventional sealed bearings and stamped engagement springs that suffer high mechanical fatigue under cyclical boost loads. Heat soak from the engine bay deteriorates the internal grease, resulting in loud bearing chirp, clutch face glazing, and violent clutch chatter upon engagement. Over time, bearing drag can cause premature accessory belt failure, clutch slippage under load, or catastrophic seizure of the factory 74mm assembly, damaging the electro-magnetic clutch plate.

The Engineering Solution

Engineered as a direct bolt-on upgrade, this 72mm unit integrates heavy-duty high-speed bearings and tempered clutch engagement springs to handle aggressive load transitions. The friction contact surface features a wear-resistant nitride coating that prevents thermal glazing and ensures positive engagement. By dropping the outer diameter from the factory ~74mm down to 72mm and reducing overall rotational mass by approximately 30%, this pulley decreases parasitic drag for quicker supercharger spool and a modest boost bump while preserving stock ECU driveability.

What's Included

• 1 x 72mm Black-Coated Clutched Supercharger Pulley

Technical Specifications

Compatibility

• 2002-2004 Mercedes Benz C-Class C32 AMG 3.2L M112K
• 2002-2004 Mercedes Benz SLK-Class SLK32 AMG 3.2L M112K
• 2004-2008 Chrysler Crossfire SRT6 3.2L M112K

Frequently Asked Questions & Fitment Warnings

Does this fit the W203/R170 C-Class,SLK-Class?

Yes, this is a direct fit for the 2002-2008 Mercedes Benz C-Class,SLK-Class equipped with the M112K engine. This does not fit naturally aspirated 3.2L M112 engines or V8 supercharged M113K platforms.

Do I need an ECU tune after installing this 72mm pulley?

No, this 72mm replacement maintains the factory clutched design and operates safely within OEM engine management parameters without requiring an ECU tune.

The Mercedes Benz Precision Standard

Preserve authentic European driving dynamics and factory refinement without sacrificing component longevity. Built to exact tolerances, this upgraded clutched pulley restores seamless supercharger engagement with zero check engine lights and no drivetrain vibrations.