RennTech ECU+ Upgrade 2021-2026 Mercedes-Maybach GLS 600 X167

The 2021-2026 Mercedes-Maybach GLS 600 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 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 622 hp and 627 lb-ft with this upgrade. That is a gain of 63 hp and 49 lb-ft.

Key details

Rated at up to 622 hp and 627 lb-ft, a gain of 63 hp and 49 lb-ft. The hand-held tuner stores both the RennTech calibration and your car's original file, connects at the OBD2 port and writes whichever one you pick to the ECU, so the ECU never has to come out of the car.

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