The multi electrode plug is far superior to the side gapped plug for performance, unless you can buy them off the shelf it's not worth the trouble of trying. Have a look at a rotary plug with it's 4 point electrode and the environment they work in and you'll understand their usefulness. They simply work better under fuel flooding plug conditions. Unless your running an Alky engine that needs help igniting a rich charge the modified plug is pretty much useless for the street. A side cut electrode is the Hotrodders first attempt at this type of plug and is not even worth bothering with.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”
— Han Solo