whats wrong with normal bosch plugs? why would the spark need the option for 4 different grounding points?
and surely there is less space for the fuel/air mixture to get around the plug, reducing its effectiveness (i know in the cylinder its a chain reaction and just needs tiny amounts of spark-but dont you want a bigger bang?
if you arent getting the iridium plugs you probably are best with normal bosch ones.
They used for longer service life and always getting the optimum spark,The Bosch Super 4 operates on the state-of-the-art air-cushion-spark principle and is the first spark plug to feature four thin ground electrodes with one pointed, silver-plated center electrode.
so the spark is always at the tip more like a surface discharge plugs , if you think about a standard plug the spark is hidden behind the electrode to a point.
but in all honesty any good quality plug is ok i have never fitted plugs of different types and noticed any performance or mpg differences in the real world .