platuim and iriudem plugs are good for lasting a long time ie in the back bank on a v6 camry where the plugs are hard to get too . from a performance view there not so good ive proved this many times in many cars racing speedway .i just use copper plugs in my skyline gapped down to .8 they have been in there 12 months and havent missed under load once so far . personally i would rather change copper plugs more often than use iruidems ect ect they just seem to fire better . my personal opinion is ngk plugs seem to work the best for me
cheers midlife crisis