RENNtech ECU Upgrade Z4 35i E89 (2008-2012 N54B30) mercedes-benz-s-class--221---2007-2013--s-550-biturbo-esr7311087 5 Series TOURING (E61) 520

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RENNtech ECU Upgrade Z4 35i E89 (2008-2012 N54B30) mercedes-benz-s-class--221---2007-2013--s-550-biturbo-esr7311087 5 Series TOURING (E61) 520RENNtech ECU Upgrade Z4 35i E89 (2008 2012 N54B30). Up to 420 HP + 435 TQ. Gains: +120 HP & +135 LB FT Our proprietary BMW ECU upgrade offers rock solid performance from RENNtech, the foremost tuning authority on Bosch and Siemens engine control units. These same units are utilized in Mercedes Benz vehicles, which RENNtech has been tuning since electronic engine management started to show up in vehicles during the mid 1980's, though our proprietary

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