RENNtech ECU Upgrade Z4 35i E89 (2008-2012 N54B30) mercedes-benz-s-class--221---2007-2013--s-550-biturbo-esr7311087 750rpm Note: Mercedes M176 engine

750rpm Note: Mercedes M176 engine performance when measured on the dyno obtains higher power numbers than rated from factory

ceramic coated  long tube headers feature top of the line big tube 2" diameter T-304 stainless steel tubing and are manufactured from the same high quality materials used on all RENNtech headers

x2 Side Pieces in Carbon Fiber

RENNtech Performance Series | Forged Wheels | Set of 2 Front and 2 Rear | Front: 22" x 10

5 Series TOURING (E61) 520 i (HP: 170 | Year: 03 > 05)

RENNtech ECU Upgrade Z4 35i E89 (2008-2012 N54B30) mercedes-benz-s-class--221---2007-2013--s-550-biturbo-esr7311087 750rpm Note: Mercedes M176 engineRENNtech 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