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Um here's a half arse answer... If it makes you feel better than do it. Everyone loves new plugs (unless you buy bosch and then you cry). most new plugs seem to feel better. There's lots of posts on this and I can sum them ALL up in 3 sentances. 1) ALL PLUGS ARE THE SAME 2)MY HI TECH PLUGS ROCK! 3)I BOUGHT BOSCH PLUGS AND MY CAR IS MISFIRRING! (this comes with 1, 2 or with a HELP tag!.)
That's basically what I've gathered from the posts. I think it totally depends on the plug and the engine. it's one of those things that will either be better or just as good...
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