RENNtech ECU Upgrade for CLS 550 (C219- 402 HP / 405 LB-FT)

RENNtech M273 Biturbo ECU Upgrades

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 reflashed at any time as many times as you wish.

CLS 550 (C219) Stock Performance:

• 382 HP @ 6000 RPM; 391 LB-FT @ 2800-4800 RPM

Gains:

• 402 HP @ 6000 RPM; 405 LB-FT @ 2800-4800 RPM