Just to add a bit here...
The plugs are very easy to change, but as others have mentioned it does require having a good selection of extentions and good dexterity to reach the front plug on each side. I did the entire job in about an hour.
I did go with the Iridium plugs because I've had good experience with them on previous cars where the plugs are hard to get to. I didn't install them as a performance upgrade. I installed them as a "less maintenance" upgrade. Have not had any problems in the 10,000 miles they've been installed.
It is generally best to stick with OEM parts.
John
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