The UPD M177 biturbo 4.0 litre performance 5 piece idler kit , includes all pulleys needed to replace the factory plastic idlers on your performance AMG with a high quality CNC billet aluminum machined performance pulley set. High quality Nachi bearings are used and heavy duty bearings seals installed to protect bearings from heat and dirt. All our billet performance idlers have a ultra hard anodized coating.

Designed and made with special machining methods to keep pulleys and bearings running with maximum longevity. Protect your investment with HD billet idlers and a 12 year proven product from a 20 year old American company.

• CNC Billet hard anodized coated *ZZ rated high speed Nachi bearings
• Smooth quiet running
• Easy install
• Made in USA and highest quality available

Replace your idlers with UPD`s performance idler set today, as the stock AMG plastic idlers are known to fail from the high heat engine/turbos and dirty conditions under the hood.

Fits all M177 engines in AMG C63 biturbo/ GLC63 biturbo models ranging from 2015-2021. May fit other m177 engines in other models that crossover form the C63 m177 engine.