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				Loud engine knocking sound
			 
 
			I just picked up my first boxster yesterday, an 01 S with 61k miles.  While driving it back I started to hear a clicking sound a couple hours in that proceeded to get louder.  It now sounds more like a loud knocking sound.  As far as I can tell it has nothing to do with rpm and putting in the clutch doesn't change anything.  If I put my hand on the e-brake I can feel the pulsing vibration, if that makes sense.  As I sit in the drivers seat it sounds the loudest from my back right.  Engine performance is just fine and I can't feel anything else wrong.
 Any ideas at what I might be looking at?
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