RENNtech ECU+ Upgrade | X166 | GLS 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 ferrari-f12--2012-2017--esr8800967 Engineered with cutting-edge CFD (computational

Engineered with cutting-edge CFD (computational fluid dynamics) software and rigorously tested for real-world performance

With the proprietary RENNtech ECU+ Tuning the W205 - C 63 AMG gains up to +56 HP and +107 LB-FT

630 sec 108

The CNC-machined 6061-T6 aluminum mounting brackets are designed to be a direct fit into the wing base

2021+ H247 GLA 35

RENNtech ECU+ Upgrade | X166 | GLS 550 | 540HP / 705LB-FT | 4.7L V8 BiTurbo | M278 ferrari-f12--2012-2017--esr8800967 Engineered with cutting-edge CFD (computationalECU+ Upgrade 540HP 705LB FT Gains: +66HP +167LB 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