The 2001 Porsche 911 has 24 valves.
The 2002 Porsche 911 has 24 valves.
The 2006 Porsche 911 has 24 valves.
The 2005 Porsche 911 has 24 valves.
The 2009 Porsche 911 has 24 valves.
The 2004 Porsche 911 has 24 valves.
The 2011 Porsche 911 has 24 valves.
The 2010 Porsche 911 has 24 valves.
The 2008 Porsche 911 has 24 valves.
The 2013 Porsche 911 has 24 valves.
The 2014 Porsche 911 has 24 valves.
The 2012 Porsche 911 has 24 valves.