RENNtech ECU Upgrade | W221 | S 550 | 500HP / 625 LB-FT | 4.7L V8 BiTurbo | M278 | MY2011-2013 mclaren-mclaren-gt-esr5735104 This process creates a laminate

This process creates a laminate with a precisely controlled resin volume and in turn is 20-30% stiffer and stronger than an equivalent thickness wet laminate process

+42 HP / +30 LB-FT

RENNtech's GT-S adjustable lowering kit offers not only overall improved aesthetics and an aggressive vehicle stance

and racing sound

After plugging the HSM into the OBD2 port

RENNtech ECU Upgrade | W221 | S 550 | 500HP / 625 LB-FT | 4.7L V8 BiTurbo | M278 | MY2011-2013 mclaren-mclaren-gt-esr5735104 This process creates a laminateECU 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