which spark plugs are good for supercharged trucks? the stock ones have been fine so far. will it make much of a difference to switch to a colder plug? or should i just keep the ones i have?

 

I went with what Kenne Bell recommended, which was Iridiums that were one heat range cooler, gapped at .35. Truck has great throttle reponse, runs at around 190 even in the hot Austin summer. Is that because of the plugs? Hard to say, but I'm happy with what I've got. BTW, I have heard from several places that Iridium is the way to go with supercharged applications, and that platinums (if that's what you got) are not recommended with FI.

 

NGK TR6 gapped at .35