Pretty much what my dad said today too after growing up with him saying NGK stood for No Good Kind I thought he was serious, guess he was just joking hurry up payday, my baby needs some new spark plugs.

 

My Trifecta dealer recommended that I go 1 step colder plugs once I was tuned. I had minor misfires when I was stock, but the dealer determined it was an injector. Replaced injector and no problems. I didn't have any problems with the stock plugs when I had them.