RENNtech ECU+ Upgrade | C217 | S 550 Coupé | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 | MY2015-2017 hsm our carbon air box is

our carbon air box is able to offer gains up to +10 hp and + 10 lb/ft of torque

GLC 63 AMG S (C253 | M177 | 4

We have found the M178 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz

For this reason

390 lb-ft @ 1

RENNtech ECU+ Upgrade | C217 | S 550 Coupé | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 | MY2015-2017 hsm our carbon air box isECU+ Upgrade 540HP 705LB FT Gains: +66HP +139LB 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. Programming takes only a few minutes and the vehicle can be