Bilstein B16 (ridecontrol) suspension kits feature ride height adjustability with standalone electronically adjustable dampers in an OE quality, direct fit package. This suspension kit allows the driver to electronically select between a Comfort or Sport setting via an in cabin mounted button. The integrated control unit switches the damping settings on all four dampers in fractions of a second to deliver the handling characteristics you desire. These kits offer monotube performance dampers with matched springs that are tuned for each specific application. The zinc coated and threaded body design will give you the flexibility to find the perfect ride height setting for your intended use while providing unsurpassed protection against the harshest road elements. B16 (ridecontrol) suspension kits are made in Germany and feature technology tested on the famed Nurburgring. BMW 525i 2007-2004; 528i 2010-2008; 530i 2007-2004; 535i 2010-2008; 545i 2005-2004; 550i 2010-2006 BMW 525i 2007-2004, 528i 2010-2008, 530i 2007-2004, 535i 2010-2008, 545i 2005-2004, 550i 2010-2006