RENNtech ECU Upgrade | GLS 450 | X166 | 402HP/454LB-FT | 3.0L BiTurbo V6 | M276 maserati-levante--2017-present--s-v6-430-ps-esr3335661 Our intermediate level ECU+ upgrade

Our intermediate level ECU+ upgrade for the Mercedes M157 Biturbo 4-MATIC engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability

Modifications to the OEM rear bumper are NOT necessary

fiber is pre-impregnated (hence the name) with resin at a production facility

The maximum power number reached with the RENNtech ECU Upgrade for the AMG GT-S is 601 HP and 582 LB-FT

493 HP @ 5000 RPM

RENNtech ECU Upgrade | GLS 450 | X166 | 402HP/454LB-FT | 3.0L BiTurbo V6 | M276 maserati-levante--2017-present--s-v6-430-ps-esr3335661 Our intermediate level ECU+ upgradeRENNtech 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