BMW Air Duct - Engine Compartment | 2004-2010 20505-HD0F-D it helps protect your engine

it helps protect your engine from potential timing issues and supports consistent power delivery

allowing users to easily switch between a catted exhaust (Sport Cat) and a cat bypass configuration

even without an engine start

colored check lights excluding turn signal indicators)

BMW Air Duct - Engine Compartment | 2004-2010 20505-HD0F-D it helps protect your engineAir Duct Engine Compartment for 528i (2008 2010), 535i (2008 2010), 550i (2006 2010), M5 (2006 2010), 650i (2006 2010), 528i xDrive (2009 2010), 535i xDrive (2009 2010), 525i (2004 2007), 530i (2004 2007), 545i (2004 2005), 645Ci (2004 2005), 530xi (2006 2007), 525xi (2006 2007), 528xi (2008), 535xi (2008)