was thinking of using this (IKBH20TT gap 0.040) to replace the OEM (FK20HBR11 gap 0.044) for my 2013 lexus gs since they are cheaper by 60% but I am worried about the gap difference.

I have heard that it is very risky to gap iridium plugs so I am wondering if the difference of 0.004 will have a tangible difference on the engine?

update: nvm i called sparkplugs.com and a pro there told me not to worry. a difference of 0.004 inches make no perceptible difference in the car. Most problems arise from the gap being too wide instead of too narrow.

Sorry to bring this thread back but I was just wondering if anybody has ever had any Bad experiences with these new Denso Iridium TT spark plugs on their IS350's?

I have them for about 10k miles and no problems so far. Same power and mpg.

Thank you for your response buister

Thanks for the update... i'm going to go with these plugs on my 08IS250

IKBH20TT

The dealer part number is FK20HBR11 (long Life) and it's also on Denso site. I'm looking at looking it in for 6X from https://www.densoproducts.com/product.aspx?zpid=11248