This kit was designed to specifically address the issue of unnecessary mass within the factory accessory pulley system. It, along with our Aluminum Alternator & Water Pump Pulleys (also available in our store), help to eliminate a considerable amount of weight relative to the factory steel parts they're replacing. Perfect fit, finish, and reliability!! Extensive street testing on our own daily-driven E63-AMG proved that these parts work flawlessly under any condition without any sacrifice.
A closer look at the pictures will show you the actual weight of our Titanium bolts compared to the weight of the factory steel bolts. It's undeniable - the numbers don't lie, and we STRONGLY believe that you can't be serious about performance and / or efficiency if you don't recognize that weight (reduction) plays a major factor in both. It does make a difference, no matter how small the detail.
Please check our other listings to see additional parts we've developed and are offering for the M156 AMG engine, as well as other vehicles within the Mercedes family.