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I found for a fact they idle better in my motor than the NGK so that works for me.

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I'm hearing a few say this.................most guys won't waste money changing plugs out unless the plug is past it's sell-by date or the engine is running intermitant , the logic here is the gap between ground strap & electrode has grown (worn) , this can cause slight misfires due to the increased voltage necessary to jump the gap , will also reduce the time period of spark , guys happy cos he fits a new set of plugs wherby the gap is correct & the misfire disappears , if these plugs happen to be a different brand the guy gets sold on em .....................just another angle on things , not bashing anyone.