Originally posted by projekakkord
So, if there are no gains in power from spark plugs or anything of that nature, then what is the difference in all the diff. spark plugs, why buy one brand over another except for how long they last?? I'm nowhere near an engine guru nor do I claim to be, but I know that I had the stock plugs that Honda uses and then I switched to the bosch +4 and then back to the stock honda ones and back to the bosch's and there is a difference.
I won't agree that there is a power difference, but the Bosch plugs are total crap.
There's a difference because your old plugs were probably dirty and used for however many miles before you changed them.
Try an NGK R plug, I guarantee you'll feel a difference between that and the Bosch, and it'll cost less too. $10 or less for a set.