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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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964 and 993 motors had twin plug engines - 12 plugs.
Many folks modify Aircooled Porsche 6-cyl motors to be twin plug designs.
Your boxster only needs 6 plugs. If you are adventurous and want to save some money and learn a new skill, replace them yourself. If not, a dealer will be happy to help you out.