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Originally Posted by FrayAdjacent
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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No, they were in production for a LONG time with 2 plug heads. I'm not sure what year it started, but it went all the way to the 993.
http://p-car.com/diy/sparkplug/