The 2014 Subaru Impreza has double overhead cam (DOHC).
The 2004 Subaru Impreza has single overhead cam (SOHC).
The 2013 Subaru Impreza has double overhead cam (DOHC).
The 2012 Subaru Impreza has double overhead cam (DOHC).
The 2003 Subaru Impreza has single overhead cam (SOHC).
The 2006 Subaru Impreza has single overhead cam (SOHC).
The 2011 Subaru Impreza has single overhead cam (SOHC).
The 2007 Subaru Impreza has single overhead cam (SOHC).
The 2009 Subaru Impreza has single overhead cam (SOHC).
The 2001 Subaru Impreza has single overhead cam (SOHC).
The 2005 Subaru Impreza has single overhead cam (SOHC).
The 2008 Subaru Impreza has single overhead cam (SOHC).