The M156 Stage 1 to Stage 2 Upgrade is for those looking to upgrade their exhaust and get more power out of their M156 Stage 1 Supercharger equipped vehicle. Once an exhaust system featuring long tube headers has been installed on the vehicle, the M156 Stage 1 to 2 Upgrade will be necessary. The upgrade includes recalibration of the ecu to Stage 2 and a new supercharger pulley to increase boost and take advantage of the long tube headers.

KEY FEATURES:

• 57mm Supercharger Pulley Upgrade

• Pulley Install Hardware Included

• Supercharger Serpentine Drive Belt

• Weistec Engineering Stage 2 Supercharger System ECU Reflash