RENNtech ECU Upgrade | C218 | CLS 550 | 480HP / 605LB-FT | 4.7L V8 BiTurbo | M278 | MY2012-2014 mercedes-benz-sl-class--231---2017-present--sl63-amg-esr2518058 Stock Axle Shaft Spline Count=

Stock Axle Shaft Spline Count= 27 splines

AMG GT S MY2015-2017 Pre-FaceLift

pulling the car to the ground for enhanced down force and stability at speed

The maximum power number reached with the RENNtech ECU Upgrade for the GT 63 AMG S 4-Door Coupe is 783 HP and 798 LB-FT

RENNtech ECU Upgrade | C218 | CLS 550 | 480HP / 605LB-FT | 4.7L V8 BiTurbo | M278 | MY2012-2014 mercedes-benz-sl-class--231---2017-present--sl63-amg-esr2518058 Stock Axle Shaft Spline Count=ECU Upgrade 480HP 605LB FT Gains: +45HP +162TQ 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