RENNtech ECU Upgrade | C218 | CLS63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2012-13 mercedes-benz-glc-class-coupe--253---2016-present--glc-63-amg-esr1091906 We typically see slightly higher

We typically see slightly higher baseline numbers than claimed by the factory

85 mph W222 - AMG S63 R3 Package w/Launch Control 2

Rated by RENNtech (peak @wheel):              584 whp @ 5

623 LB-FT @2

RENNtech ECU Upgrade | C218 | CLS63 AMG | 638 HP / 695 LB-FT | M157 | 5.5L V8 BiTurbo | MY2012-13 mercedes-benz-glc-class-coupe--253---2016-present--glc-63-amg-esr1091906 We typically see slightly higherECU Upgrade Up to 638HP 695TQ Gains: +88HP +151TQ RENNtech M157 Biturbo ECU Upgrades are TV approved! Our intermediate level ECU upgrade for the Mercedes M157 engine still offers huge gains in performance across the entire RPM range, but with a slightly reduced peak HP and torque from our standard tune. This is ideal for customers who want increased performance in their daily driver without worry of extra strain on driveline components or for areas