yea, but thats diff, if ur plugs r shitty, ur gonna bein bogging and shyt and ur car wont run right,like it wont run as rich, but if u get a new plug, u'll run more richer, hmm i havent changed plugs in my car yet but i had a dirtbike that was a 4 stroke, n the spark plug in that went bad once n i would jus bog around places, the reason that was happening is cuz the old plug wasnt giving much of a spark, but when i changed the plug, i got the spark i needed n it ran better, u really wont get any power jus a better ride and shyt, it will feel like more power cuz if ur old plugs r junk then yea..like i said it wont have much spark, but when u change them, then more spark.