just installed a set of autolite XP in the car. a few days later i was looking over the parts list for the car and notice that the plug i was given were for the SRT not for the NA engine. i guess it is the same plug just a little colder. i really do not want to take them out and put in new ones. the car seems to run fine now but now sure what a colder plug will affect the engine after a few miles on them.
any recommendations?

 

one step colder plug, the car will run better, if you are a aggressive driver ,,, but if you putt putt around then maybe go one step hotter than stock.
read this
HowStuffWorks "Spark Plug"
jim

 

i mostly normal driving with some spirited runs sometimes

i was mostly thinking it would be ok with less "ping" just wanted to be sure