Eliminate weak factory plastic idlers with the UPD M156 Billet Idler Set - a high-strength CNC aluminum upgrade built for smoother operation, extreme durability, and long-term AMG reliability.
Eliminate weak factory plastic idlers with the UPD M156 Billet Idler Set - a high-strength CNC aluminum upgrade built for smoother operation, extreme durability, and long-term AMG reliability.
Upgraded Weistec Idler Pulley Kit
This product was last offered at the strikethrough price on
09-22-2026
Unleash 1300+ HP potential with the PTG 4.0L M156 Supercharger System, featuring a Whipple compressor, air to water intercooling, and an 8 rib belt drive engineered for extreme power and reliable performance.