RENNtech ECU Upgrade | R231 | SL 550 | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 audi-sq5--2009-2017--2-0l-tfsi-i4-esr7061777 Front Splitter:

Front Splitter:

which RENNtech has been tuning since electronic engine management started to show up in vehicles during the mid 1980's

Performance Package 2 Includes:

R1 Performance Package for Maybach

745 HP +97 HP 767 LB-FT +54 LB-FT X167 - AMG GLS 63 R1 Package 773 HP +112 HP 788 LB-FT +75 LB-FT X167 - AMG GLS 63 R3 Package 875 HP +227 HP 873 LB-FT +160 LB-FT

RENNtech ECU Upgrade | R231 | SL 550 | 500HP / 625LB-FT | 4.7L V8 BiTurbo | M278 audi-sq5--2009-2017--2-0l-tfsi-i4-esr7061777 Front Splitter:ECU 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