Depends. A 135i, 5 series, 6 series, 7 series, M series, X5M or a X6M are fast but anything else are not as fast.
The 2005 BMW 6-Series has a 6-speed manual.
The 2012 BMW 6-Series has an inline 6 engine.
The 2013 BMW 6-Series has an inline 6 engine.
The 2014 BMW 6-Series has an inline 6 engine.
The 2008 BMW 6-Series has a 6-speed manual.
The 2009 BMW 6-Series has a 6-speed manual.
The 2006 BMW 6-Series has a 6-speed manual.
The 2007 BMW 6-Series has a 6-speed manual.
The 2004 BMW 6-Series has a 6-speed manual.
The 2010 BMW 6-Series has 32 valves.
The 2009 BMW 6-Series has 32 valves.