they have after market coils that can bump up ponies, but I'm wondering if it will shorten life of plugs? Looks like you have to gap to spec as well. I'm not in position right now, neary 4-5 hundred bucks and I need to replaster the pool. new coils make 91 octane a must? I wouldn't mind that anyhow, costco has 87 and 91 no 89, that would make it official, just run 91.
I've played with hotter COP's before on Fords. If you get good ones, like the DUI cops, they'll output a hotter voltage, but without opening the gap it doesn't do much for you. If you get crap like the Granatelli's or the Accel/MSD then you'll be replacing coils like crazy (1st hand burns on those). Ultimately they just provide more voltage to arc across a wider gap, but with a stock gap the overall power output to the plugs won't change much. They will help if the stock coils aren't providing the best spark they can, but once you hit enough arc voltage then the equation transitions to amperage which is going to be dictated by the plug's overall resistance. Same resistance, same overall power output once the arc strikes.
I've been thinking about combining the SOS COP's with Brisk Silver plugs in the Challenger to run a wider gap, like .065, to get some more power out of it. The hotter spark with silver plugs would mean a rather short life, but honestly that doesn't matter much to me since that car averages 5k or less per year.
Now on the Ram I'll probably swap from Iridum to the new Ruthenium plugs at stock gap as they should have slightly better ignitability while still giving a good service life since I really don't feel like doing 10k or shorter plug swaps on the daily driver.