Bigger spark does not necessarily mean more complete combustion. There r other factors n plenty of other methods to achieve tis (eg. iDSi's dual plug concept) when it comes to tis.

But seriously, by increasing the current to the plug n thus a bigger spark, it should technically wear down d plugs faster than d normal recommended rate. Wats d new recommened service period for d plugs or do we need tougher (higher rating) plugs once tis is installed? N do we need to keep an eye on d ignition system (distributor, plug cable etc)?