RENNtech Smart Car ECU Upgrade (69HP/66LB-FT) mercedes-benz-e-class-sedan--212---2010-2013--e-350-esr7514707 The R1 performance package increases

The R1 performance package increases performance to 611 hp and 592 lb/ft without sacrificing daily driver comfort or reliability

the R3 upgrade includes RENNtech Stage II Turbo’s

we recommend remapping the ECU in order to prevent potential »check engine light« warning signals

but at higher rpm it fully unleashes an incredible deep sporty sound from the F1-inspired

RENNtech Smart Car ECU Upgrade (69HP/66LB-FT) mercedes-benz-e-class-sedan--212---2010-2013--e-350-esr7514707 The R1 performance package increasesRENNtech Smart Car ECU Upgrade. Up to 69HP and 66LB FT. Gains: +5HP & +5LB FT Our proprietary SMART 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 tuning software and