Officially 8.0 seconds for a 2.5 litre manual transmission. I think you may be quicker than this if you hold out in second gear.
The 2011 BMW 3-Series has a 6-speed manual.
The 2009 BMW 3-Series has a 6-speed manual.
The 2012 BMW 3-Series has a 6-speed manual.
The 2003 BMW 3-Series has a 5-speed manual.
The 2007 BMW 3-Series has a 6-speed manual.
The 2005 BMW 3-Series has a 5-speed manual.
The 2010 BMW 3-Series has a 6-speed manual.
The 2001 BMW 3-Series has a 5-speed manual.
The 2004 BMW 3-Series has a 5-speed manual.
The 2002 BMW 3-Series has a 5-speed manual.
The 2006 BMW 3-Series has a 6-speed manual.
The 2008 BMW 3-Series has a 6-speed manual.