+15HP +45TQ

RACE DOWNPIPE REQUIRED

The Weistec M274 ECU upgrade for the 2015+ C300 provides gains across the entire powerband resulting a vehicle that is more fun to drive in all driving situations.  The M274 ECU upgrade can be paired with our M274 Downpipe for further improved response and exhaust note  

*Power gains vary based on model and modifications.

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

KEY FEATURES:

- Increased HP and Torque

- Improved Throttle Response

- Optimized Fuel and Spark

- Improved Airflow