R1 Performance Package | W220 | S 55 AMG | 372 HP / 411 LB-FT | 5.5L NA V8 | M113 maserati-levante--2017-present--v6-esr9770991 Performance package R2 takes performance

Performance package R2 takes performance to the next level and is the next step up from our R1 tuning package

235 HP @ 5700 RPM

GLS 450 BiTurbo (X166 - M276 Biturbo 4-MATIC Engine) Modified Performance:

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We have found the new M256 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz

R1 Performance Package | W220 | S 55 AMG | 372 HP / 411 LB-FT | 5.5L NA V8 | M113 maserati-levante--2017-present--v6-esr9770991 Performance package R2 takes performanceR1 Performance Package for 220 S 55 AMG. Includes ECU Upgrade and Carbon Fiber Air Box. Up to 372HP and 411 LB FT. The R1 performance package for the Mercedes 55 series engine includes our proprietary ECU upgrade in addition to our full carbon fiber airbox upgrade which offers a larger volume of incoming air for better engine breathing and improved cylinder filling. This combination that provides noticeable increases horsepower, torque and throttle