RENNtech ECU Upgrade | W221 | S 550 | 500HP / 625 LB-FT | 4.7L V8 BiTurbo | M278 | MY2011-2013 mercedes-benz-c-class--204-sedan---2008-2014--c-63--amg-black-series-esr3194090 6 : 1 and 5

6 : 1 and 5

C253 - GLC 43 AMG Coupe | *Needs to be equipped with optional performance exhaust/factory valves*

5 at 5620 rpm  + 10

L or Tall Bracket Profile SKU: 88

GLA 45 AMG (H247 -chassis)

RENNtech ECU Upgrade | W221 | S 550 | 500HP / 625 LB-FT | 4.7L V8 BiTurbo | M278 | MY2011-2013 mercedes-benz-c-class--204-sedan---2008-2014--c-63--amg-black-series-esr3194090 6 : 1 and 5ECU Upgrade 500HP 625LB FT Gains: +52HP +87LB 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