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 fuel quality concerns. 

Our intermediate ECU tune increases performance from 429 HP and 516 lb/ft torque to 470 HP and 513 lb/ft at the crank! This is a slight reduction from our standard tune but still offers white knuckle performance at one of the most affordable price points in the tuning market.

C217 - S 550 Coupé – M278 | 4.7L V8 BiTurbo Stock Performance:

• Rated by Mercedes-Benz:       49 HP @ 5,250-5,550 RPM  |  516 LB-FT @ 1,800-3,500 RPM 

C217 - S 550 Coupé – M278 | 4.7L V8 BiTurbo RENNtech Upgraded Performance:

*Applies to all Models, crank power calculation based on 17% Drivetrain loss on 4-MATIC models

• Rated by RENNtech:           480 HP @ 4,500 RPM  |  523 LB-FT @ 2,850-3,450 RPM