The thing is they are about 4x more expensive than stock:
www.design911.co.uk/fu/pt697.../Boxster/Plasma-Direct-Coils/
I dont want to spend that much without hardly noticing any difference.
they say that it produces 100% more spark, which makes what you guys are saying make sense about the life of the plugs.
I just bought iridium power spark plugs, i beleive they are already an improvement as spark goes.