i think leads are more inportant than the plugs, the leads get hot/cold, wet dry etc, and they are only protected with a thin bit of rubber! the plugs are deep in the motor so they dont really get wet and are ceramic coated so heat etc dont bother them. leads will make more difference than plugs... and DONT get halfrauds BOSCHE leads. one plug cap actually fell off when i removed the leads from my car (they were new, made it run bad, so i was putting the nissan ones back on). get magnecor as alan said!!