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It is not a better or worse situation. If you are NA, the correct heat range for you would be the TR55. With forced induction such as superchargers, you will want a cooler spark plug. This is where the TR6 comes in to play.
Hope this helps,
I see people talk about "colder" plugs, but I don't quite understand what this means. Can someone tell me what makes a plug "colder" in layman terms? Thanks
A colder plug is designed to keep the combustion process at a colder temperature than a standard heat range plug. That's why it's good to go colder for forced induction; blower, turbo or nitrous; which creates added heat that can cause damage.
A "colder" plug does not lower combustion temperature, but rather only the temperature of the center electrode. If the electrode is too cold, deposition will form and misfiring may occur. If it is too hot, detonation, rapid wear, and even catastrophic electrode failure may occur.
Simply looking at the plugs provides a tremendous amount of information supporting any possible temperature change. I am sure you can find a "how to read sparkplugs" chart on the net somewhere.