RENNtech ECU Upgrade | R231 | SL 550 | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 mercedes-benz-amg-gt--190---2015-2017--gt--2016-2017--esr9621144 similar to the pocketing process

similar to the pocketing process

Please note that the Mercedes M178 engine performance when measured

CLASS R (W 251) 350 V6 Blue Efficiency (HP: 306 | Year: 12 > )

CLS 53 AMG

RENNtech ECU Upgrade | R231 | SL 550 | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 mercedes-benz-amg-gt--190---2015-2017--gt--2016-2017--esr9621144 similar to the pocketing processECU Upgrade 500HP 625LB FT Gains: +26HP +59LB FT RENNtech tuning products are certified to meet CARB standards in all 50 States. 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