Given the huge expense Mopar has spent over the years in development and production, I have to say they had to have seen an overwhelming benefit of the dual plug design. Whether that benefit is in power or emissions, I have not determined, but whatever it was had to offset quite significant cost increases. A

s I am in production of vehicles, I know those engineers had to make quite a case to management/penny-pinchers to get those extra 8 spark plugs per car, the added raw materials into the head and a coil to handle both plugs as well...and they won. I'll carryover their lessons learned and just run the 16 plugs, if it's just for emissions...well that's fine too. The cost is insignificant.