BMW 535i (N54, 2008–2010). BMW 535xi (N54, 2008). BMW 535i xDrive (N54, 2009–2010). BMW 535i Gran Turismo (N54, 2010). BMW 535i xDrive Gran Turismo (N54, 2010). This low-pressure fuel pump assembly increases fuel system capacity to support higher horsepower levels and ethanol use.