RENNtech ECU Upgrade | W222 | S 550 | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 | MY2014-2017 mercedes-benz-slr-mclaren-slr-mclaren-722--2006-2011--esr6133838 The units may show light

The units may show light aesthetic imperfections which may in no way interfere with the functionality of the turbo

electrical connectors as well as a new transmission pan filter

0L Engine) Stock Performance:

The RENNtech Lower Control Arm give the best improvment in combinatino with the RENNtech Toe Link Kit

To return the car back to stock PRE-SAFE settings turn the switch over to STOCK and plug it back into OBD2 port

RENNtech ECU Upgrade | W222 | S 550 | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 | MY2014-2017 mercedes-benz-slr-mclaren-slr-mclaren-722--2006-2011--esr6133838 The units may show lightECU Upgrade 500HP 625LB FT Gains: +26HP +59LB FT Our intermediate level ECU upgrade for the Mercedes M278 engine still offers huge gains in performance across the entire RPM range, but with a slightly reduced peak HP and torque from our standard tune. This is ideal for customers who want increased performance in their daily driver without worry of extra strain on driveline components or for areas and countries with extreme altitudes, temperatures or