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Anyplace that sells batteries can get you the correct size for your Porsche. You do not have to purchase a battery from Porsche.
The 2006 Porsche Cayenne has double overhead cam (DOHC).
The 2012 Porsche Cayenne has double overhead cam (DOHC).
The 2008 Porsche Cayenne has double overhead cam (DOHC).
The 2009 Porsche Cayenne has double overhead cam (DOHC).
The 2013 Porsche Cayenne has double overhead cam (DOHC).
The 2011 Porsche Cayenne has double overhead cam (DOHC).
The 2004 Porsche Cayenne has double overhead cam (DOHC).
The 2014 Porsche Cayenne has double overhead cam (DOHC).
The 2010 Porsche Cayenne has double overhead cam (DOHC).
The 2005 Porsche Cayenne has double overhead cam (DOHC).
The 2003 Porsche Cayenne has double overhead cam (DOHC).