well i got my (birthday)tax return and figured i'd try this thing out. i gapd them and put them in and the misfire was hellaious, i mean it was like the timing was off bad at idle. so i tried to give them time to adjust the ecu or let the ecu try to adjust to them. The only thing that changed was the idle that would almost sound like a cam'd out v8. the transition into boost started the missfire all over again so with that and this being my main car i took them out and put the old NORMAL spark plugs in and if i do try to put them back in i will have to tune the mpi to see if i can over come the misfire problem. so beware they don't seem to like our cars but mines has the MAM SS kti with mpi so if you do get them you might have better luck. just in case you want to see the web site www.pulstarplug.com