RENNtech ECU Upgrade for E 550 | W211 | 402 HP / 405 LB-FT | MY2007-2009 mercedes-benz-cls-class--219---2006-2011--cls-500-esr9637543 The part comes in standard

The part comes in standard primer or black paint

Increasing the power output without upgrading the OEM turbo charger may increase the chance of Turbo -failure

A 45 AMG (MY2013+ | W176 | M133 | 2

CLASS S (W 220) 500 V8 4-matic [5 gear] [2 Filters Required] (HP: 306 | Year: 98 > 03)

CLASS GLK (X 204) 280 4-matic [2 Filters Required] (HP: 231 | Year: 08 > 09)

RENNtech ECU Upgrade for E 550 | W211 | 402 HP / 405 LB-FT | MY2007-2009 mercedes-benz-cls-class--219---2006-2011--cls-500-esr9637543 The part comes in standardRENNtech ECU Upgrade for 211 E 550. Up to 402HP and 405LB FT. Gains: +20HP & 14LB 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