RennTech ECU Upgrade 2012-2015 Mercedes-Benz ML 400 BiTurbo X166

The 2012-2015 ML 400 BiTurbo responds well to software, and RennTech has been writing engine calibrations since electronic engine management arrived in the mid-1980s. This ECU Upgrade rewrites ignition timing, throttle mapping, fueling and boost control on the 3.0L M276 twin-turbo V6, so the extra power arrives across the whole rev range without giving up everyday drivability. RennTech rates the ML 400 BiTurbo at up to 392 hp and 432 lb-ft with this upgrade, a gain of 63 hp and 78 lb-ft.

Watch it explained

Features

• Loaded through the RennTech HHT hand-held tuner via the OBD2 port, no ECU removal
• The HHT stores the tuned and the factory file, so you can switch back to stock any time
• 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

What is included

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

Specs

Fitment notes

For the ML 400 BiTurbo (X166), 2012-2015 as listed by RennTech. Please include your VIN with the order so RennTech can confirm the exact application. Check the fitment table before ordering, and contact us if your car differs.

Fitment