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Replacing your spark plugs can't hurt, especially if you have that many miles on them.
If you go with what Porsche approves of i.e. Bosch.
It will improve your performance, you will notice the biggest difference after that improvement, compared to the other tasks you will be doing.
Good luck, and you will be surprised what you will learn as you do it.
It is quite simple, just awkward. Take your time and start all your new plugs by hand.
Check the gap and "Never" take the stores word that they are pre-gapped.
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