RennTech Intermediate ECU Upgrade 2017-2023 C 63 / S Coupe

The 2017-2023 C 63 AMG / C 63 S Coupe responds well to software, and RennTech has been writing engine calibrations since electronic engine management arrived in the mid-1980s. This Intermediate ECU Upgrade rewrites ignition timing, throttle mapping, fueling and boost control on the 4.0L M177 twin-turbo V8, so the extra power arrives across the whole rev range without giving up everyday drivability. RennTech rates the car at 574 hp and 612 lb-ft with this upgrade. That is a gain of 48 hp and 80 lb-ft.

Key details

This intermediate stage for the C 63 and C 63 S makes up to 574 hp and 612 lb-ft, a gain of 48 hp and 80 lb-ft. It is CARB certified in all 50 states, and the OBD2 hand-held tuner flips between tuned and stock without ECU removal.

Watch it explained

Features

• Revised ignition timing, throttle mapping, air-fuel ratios and boost control
• Gains across the entire rev range, not just at peak
• Developed on RennTech's own dyno and road tested
• Keeps factory-like drivability and reliability for daily use
• 93 octane or better recommended for the full calibration

What is included

• RennTech calibration for your car
• Delivery as listed by RennTech for this model (HHT tuner or ECU flash)

Specs

Fitment notes

Fitment is as listed by RennTech for this part number. Your VIN is required with the order.

Fitment