The physical dimensions of the spark plugs required to cover 80% of the current vehicle inventory are precisely the dimensions of the 5 Pulstar models. Functional and operations differences between Pulstar and conventional plugs occur in heat range, electrode design and configuration, spark placement in the cylinder, and spark gap, all which raise the required coverage for conventional spark plugs into the hundreds of models required to service the same number of vehicles that Pulstar covers with 5 models. This is possible by Pulstar due to the very powerful spark discharge that will ignite a fuel charge proximate the spark gap, burn it more completely and quicker than a conventional plug. The Pulstar heat range is 2-3 heat ranges cooler than typical for the application due no longer to the requirement of percolating off unburned fuel. The spark gap recommended by the manufacturer is the same as Pulstar recommends, eliminating the gap issue, and only one, simple negative electrode is required to close the high voltage circuit and make a spark. Multiple electrodes actually inhibit consistent flame front propagation in the cylinder.