I thought about using those, but read somewhere they weren't needed, especially if you use the iridium plugs. They claim the iridium plugs will never need changed again. I will probably do it in a few years if I haven't upgraded to an 09 boxster
yep, pedro is the man, I just add my little hints I learned the hard way. If you haven't done the serpintine belt I would suggest that, as it was easy. Also oil was a breeze once I bought the canister remover tool from autozone. I believe its "B". Next is the throttle body cleaning. I hear that is the best remedy for a bad idle. Pedro has that one also. All I have left is Fuel filter, air filter, tires(tomorrow) and fix my rear window.
Good luck and look at it as a way to get to know your car better.