DISA Valve, short name for Differenzierte Sauganlage controls the air in the intake system optimizing performance and fuel. It closes at low RPM's and opens up at high RPM's to pressurized air and make it more combustible. If your vehicle is idling rough, experiencing poor fuel economy, loss of power, hearing rattling noise from the engine then you may need to replace your DISA valve. Compatible with the following Vehicles: 2003-2006 325Ci 2.5L M56 2003-2005 325i 2.5L M56 2001-2006 330Ci 3.0L 2001-2006 330i 3.0L 2001-2005 330xi 3.0L 2001-2005 530i 3.0L 2004-2005 545i 4.4L 2004-2005 645Ci 4.4L 2002-2005 745i 4.4L 2002-2005 745Li 4.4L 2007-2008 Alpina B7 4.4L 2004-2006 X3 3.0L 2001-2006 X5 3.0L 2001-2002 Z3 3.0L 2003-2006 Z4 3.0L Replaces Part Numbers: 11 61 7 502 275, 11 61 7 544 805, 911-900, 911900, 11617544805, 11617502275 This is a compatible replacement part manufactured by AA Ignition. This intake manifold valve is NOT a genuine part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this intake manifold valve fits.