depends on the model
944, 924, 951, 928, 968, Cayenne=Front mounted engine
356, 911, 912=Rear
Boxster, 914, Carrera GT, Cayman= Mid engine
This may not be a complete list but should help I don't claim to be an expert if this is incorrect.
In the driver's side of the engine bay, at the front of the engine.
The clutch is located behind the engine, just before the torque tube leading to the gearbox.
The 2011 Porsche Panamera has a V6 engine.
The 2013 Porsche Panamera has a V6 engine.
The 2009 Porsche Cayenne has a V6 engine.
The 2011 Porsche Cayenne has a V6 engine.
The 2005 Porsche Cayenne has a V6 engine.
The 2012 Porsche Panamera has a V6 engine.
The 2010 Porsche Panamera has a V8 engine.
The 2014 Porsche Cayenne has a V6 engine.
The 2003 Porsche Cayenne has a V8 engine.
The 2014 Porsche Panamera has a V6 engine.