RENNtech ECU Hand Held Tuner | HHT | CLS 63 AMG | C219 | 534HP/485LB-FT| 6.3L N/A | M156 | MY2007-2011 mercedes-benz-gls-class--167---2020-present--gls-450-esr7245365 RENNtech ECU HHT (HandHeldTuner) for

RENNtech ECU HHT (HandHeldTuner) for the 230 - SL 600

Limited Edition RENNtech 35th Anniversary Wall Calendar for 2024

and modifying boost mapping for turbo-chargers the Mercedes-AMG 53 M256 3

Our proprietary ECU upgrade for the Mercedes M277 engine offers huge gains in performance across the entire RPM range without sacrificing around town comfort or daily driver reliability

Power figures are calculated with a 16% drivetrain loss for AWD 9-speed vehicles

RENNtech ECU Hand Held Tuner | HHT | CLS 63 AMG | C219 | 534HP/485LB-FT| 6.3L N/A | M156 | MY2007-2011 mercedes-benz-gls-class--167---2020-present--gls-450-esr7245365 RENNtech ECU HHT (HandHeldTuner) forRENNtech ECU HHT (HandHeldTuner) for the 219 CLS 63 AMG. Up to 534HP and 485LB FT LB FT. Gains: +27HP & +20LB FT. 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 the file you choose directly to the ECU.