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S 550 BiTurbo

RENNtech ECU Upgrade | W221 | S 550 | 500HP / 625TQ | 4.7L V8 BiTurbo | M278

ECU Upgrade | 500HP / 625LB-FT | Gains: +52HP / +87LB-FT

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RENNtech ECU+ Upgrade | W221 | S 550 | 540HP / 705TQ | 4.7L V8 BiTurbo | M278

ECU+ Upgrade | 540HP / 705LB-FT | Gains: +92HP / +167LB-FT

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