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.
*Product may not be emissions compliant. Check local laws prior to installation.?
