Hello I am looking at switching out the stock spark plugs on my V6, I read that the Autolite Spark Plugs Model # AP5143, are some good ones. I really don't know much about spark plug replacement, but hear that you can gain 20hp~ by changing the stock ones to platinum. Can anyone give me some insight; whether this would be a good idea, or is this an area to tread carefully in? Also any suggestions on what to get and what heat range and stuff would be great, thanks!