RENNtech ECU Hand Held Tuner (HHT) for E 500 | W211 | 320 HP / 355 LB-FT | MY2003-2006 mercedes-benz-e-class-coupe--207---2010-2013--e-550-biturbo-esr7403570 RPM Tuned: 637 HP |

RPM Tuned: 637 HP | 625 LB FT

RENNtech M157 Biturbo ECU Upgrades are TÜV approved

CLASS S (W 220) 350 V6 4-matic [2 Filters Required] (HP: 245 | Year: 02 > 05)

SLK (R 170) 200 (HP: 136 | Year: 96 > 00)

RENNtech ECU Hand Held Tuner (HHT) for E 500 | W211 | 320 HP / 355 LB-FT | MY2003-2006 mercedes-benz-e-class-coupe--207---2010-2013--e-550-biturbo-esr7403570 RPM Tuned: 637 HP |RENNtech ECU HHT (HandHeldTuner) for the 211 E 500. Up to 320HP and 355 LB FT. Gains: +18HP & +16LB 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