RENNtech ECU Upgrade | GLS 450 | X166 | 402HP/454LB-FT | 3.0L BiTurbo V6 | M276 mercedes-benz-gle-class-coupe--292---2016-2020--gle-400-esr7114246 Once the settings are loaded

Once the settings are loaded

Includes Upgraded Turbos

Up to 428HP and 417TQ

Our intermediate ECU tune increases performance from 550 HP and 544 lb/ft torque up to 638 HP and 695 lb/ft at the crank

Up to 402HP and 454LB-FT

RENNtech ECU Upgrade | GLS 450 | X166 | 402HP/454LB-FT | 3.0L BiTurbo V6 | M276 mercedes-benz-gle-class-coupe--292---2016-2020--gle-400-esr7114246 Once the settings are loadedRENNtech ECU Upgrade for 166 GLS 450 BiTurbo 4 MATIC. Up to 402HP and 454LB FT. Gains: +40HP & +70LB FT RENNtech M276 Biturbo ECU Upgrades are TV approved! RENNtech HHT (hand held tuner) allows you the unlimited ability to switch between tuned and stock ECU programming and requires no ECU removal! Our proprietary tuning module stores both the RENNtech tuned file and your vehicles stock file. The module plugs directly into the OBD2 port and delivers