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5L V8 Supercharged) Stock Performance:
SL 500 (R230) Stock Performance:
700rpm Note: Mercedes M177 engine performance when measured
and a more linear power curve
Porsche Panamera Turbo (971) 2016 - 2020
RENNtech ECU Upgrade for S 65 (W221- 670 HP / 840 LB-FT) maserati-mc20-esr2615562 5L V8 Supercharged) Stock Performance:RENNtech ECU Upgrade for 221 S 65 AMG. Up to 670HP and 840TQ. Gains: +49HP & +102LB FT RENNtech has been at the forefront of ECU tuning since electronic engine management started to show up in vehicles during the mid 1980's! Our experience, countless hours of in house research, development and exhaustive testing ensure that our proprietary ECU upgrade offers incredible performance gains and rock solid daily driver reliability. RENNtech tuning software
US$ 30.90
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