RENNtech ECU Upgrade for S 550 | W221 | 402 HP / 405 LB-FT | MY2007-2010 aston-martin-dbx707-esr8045635 producing superior surface quality and

producing superior surface quality and ensuring an OEM standard level of fitment

465 whp @ 4

Rated by RENNtech (peak @crank):              783 HP @ 5

side skirts

E400 (MY2018+ | W213 | M276 | 3

RENNtech ECU Upgrade for S 550 | W221 | 402 HP / 405 LB-FT | MY2007-2010 aston-martin-dbx707-esr8045635 producing superior surface quality andRENNtech ECU Upgrade for 221 S 550. Up to 402HP and 405 LB FT. Gains: +20HP & 14 LB 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