AFAIK, no flat six engines in any Porsche available for sale had twin plugs. (that is, 2 per cylinder).
HOWEVER, Porsche Racing used twin plugged cars, and it's also a popular modification on Porsche engines for track/racing cars.
That being said, yes, the SIX CYLINDER Boxster uses SIX plugs.
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2001 Boxster - Grey on Grey
1969 911T Targa - 'Stinky'
http://www.zoto.com/frayadjacent/img...f27a-4a399.jpg <---- my car. ^ crap I post.
"The existence of the flamethrower is evidence that someone, somewhere once said 'I want to set those people over there on fire, but I don't want to have to walk over there to do it.'"