RENNtech ECU Hand Held Tuner (HHT) for CLS 500 | C219 | 320 HP / 355 LB-FT | MY2005-2006 audi-s3--8p---2006-2012--2-0l-tfsi-esr5566206 We have found the M177

We have found the M177 engine stock performance numbers vary from the baseline figures claimed by Mercedes Benz

RENNtech ECU Upgrade for Rolls Royce Dawn

Gains: Up to +222 HP | +83LB-FT

it requires no splicing or soldering

the Sport 1 is tailored to fit specific current and late model Mercedes-Benz and AMG vehicles without any modification

RENNtech ECU Hand Held Tuner (HHT) for CLS 500 | C219 | 320 HP / 355 LB-FT | MY2005-2006 audi-s3--8p---2006-2012--2-0l-tfsi-esr5566206 We have found the M177RENNtech ECU HHT (HandHeldTuner) for the 219 CLS 500. Up to 320HP and 355 LB FT 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.