My motorcycle has two plugs for the reason below, nothing to do with making it super duper.
'Usually 2 plugs are used because of poor combustion chamber design and is employed as a compromise, to help the fuel/air mixture ignite more completely. Hemispherical heads commonly use this because, although they can be made to produce a lot of power, because of improved airflow through the valves due to the canted valves / valve placement, they are not always the most efficient design. If the valves aren’t spaced far enough apart in the center, a plug cannot fit where it ideally needs to go, so they put 2 plugs - one on each side - to mitigate the bad / compromised chamber design.'