the ARs have a shorter grounding strap than conventional plugs, better chance of not detonating, i think, i know they recommend these plugs for nitrous/supercharger/turbo applications. you can get these plugs from autozone but they have to be ordered, takes about a day to get in. i do know that ppl shouldn't run iridiums or plat plugs. i've had good luck with these plugs, spraying for about two years.